Apparatus and method for evacuating contaminants and water vapor from an area above a swimming pool with integral deck drain

Abstract

An apparatus captures and evacuates air from an area above a body of liquid, particularly a swimming pool. The apparatus exhausts the contaminants and water vapor to an area outside of an enclosure housing the swimming pool. A perimeter deck drain assembly extends around the pool and is connected to at least one conduit for collecting and draining deck water, at least one tray for directing the water in the conduit to a drain, a grating system for receiving water from the pool deck, at least one exhaust conduit, and at least one exhaust apparatus for directing the contaminants and water vapor to a desired area. The evacuation apparatus may be in the form of a bench positioned on a floor or deck surrounding a pool. The invention also provides an associated method for evacuating contaminants.

Claims

1. An apparatus for directing air including water vapor and contaminants to an exhaust conduit from an area above a pool enclosing a body of liquid, the pool adjacent to and surrounded by a grating system that is positioned between a deck and the pool, said apparatus comprising: a sidewall and an opposite sidewall both connected to a bottom wall to define a channel collecting and circulating liquid received from the body of liquid through the grating system, wherein said sidewall is connected to the pool; a conduit directing the air including water vapor and contaminants to the exhaust conduit, said conduit being connected to said opposite sidewall and the deck, in a position that avoids collecting the liquid received through the grating system in the conduit such that the conduit extends alongside and parallel to the channel under the deck, said conduit defining a first port between the deck and said opposite side wall the port receiving the air including water vapor and contaminants, and the conduit further defining a second port, wherein the second port directs condensed water vapor from the conduit to a drain so that the condensed water vapor is not returned to the channel.

2. An apparatus according to claim 1, wherein said first port opens through the deck.

3. An apparatus according to claim 1, wherein said first port opens under the deck.

4. An apparatus according to claim 1, wherein said opposite sidewall defines said first port and said second port.

5. A system for evacuating contaminants and water vapor from an area above a swimming pool to an exhaust conduit, the pool being adjacent to and surrounded by a grating system that is positioned between a deck and the pool to receive liquid from the pool, said system comprising: a perimeter deck drain assembly extending around at least a portion of the swimming pool and under the deck, said deck drain assembly having an upper section defining a conduit directing air to the exhaust conduit and connected to the deck in a position that avoids collecting, within the conduit, the liquid received through the grating system, and a lower section defining a channel collecting and circulating liquid received from the swimming pool, the upper section defining a first port that opens through the deck and spaced apart from the grating system for collecting and circulating air, and the upper section further defining a second port that directs condensed water vapor away from the channel and into a drain; at least one tray for directing liquid secured to lower portions of said two side sections of said deck drain assembly; a grating system for receiving water and positioned against said upper section of said deck drain assembly; at least one air source for directing a flow of air downwardly against and across the surface of the swimming pool, and outwardly towards said perimeter deck drain; at least one exhaust conduit for evacuating the contaminants and water vapor, said at least one exhaust conduit in communication with said at least one conduit; and an exhaust apparatus for drawing the contaminants and water vapor through the at least one conduit in a flow direction that is parallel to the deck and directing the contaminants and water vapor to a desired area spaced apart from the pool; wherein flowing air from said at least one air source creates a zone for containing contaminants and water vapor substantially above the pool surface; and wherein flowing air directs contaminants and water vapor from the containment zone through said grating system into said at least one conduit and to said at least one exhaust conduit in an air flow direction that is parallel to the deck.

6. An apparatus according to claim 5 further comprising: at least one air source for circulating a flow of air substantially adjacent to the containment zone; wherein the flowing air maintains the integrity of the containment zone and facilitates circulation of air substantially adjacent to the containment zone.

7. An apparatus according to claim 5 further comprising an enclosure for housing the apparatus and swimming pool.

8. A system for evacuating air from an area above a body of liquid in a pool adjacent to and surrounded by a grating system that is positioned between a deck and the pool to receive liquid from the pool, said system comprising: at least one air source directing a flow of air substantially downwardly toward the liquid in the pool and the deck; a deck drain assembly extending around at least a portion of the pool, said deck drain assembly comprising a sidewall and an opposite sidewall both connected to a bottom wall to define a channel collecting and circulating liquid received from the pool, wherein said sidewall is connected to the pool; a conduit connected to said opposite sidewall and the deck, said conduit in a position that avoids collecting, within the conduit, the liquid received through the grating system and defining a first port proximate the deck and a second port directing condensed water out of said conduit and into a drain; a grating system receiving liquid and air and positioned flush with the deck against said deck drain assembly; an exhaust fan drawing air through said conduit, said exhaust fan evacuating the air suspended between said grating system and said condensation drain via said conduit in an air flow direction that is parallel to said deck.

9. The system of claim 8, further comprising an exhaust conduit connecting said conduit to said exhaust fan, wherein said conduit directs air, contaminants, and water vapor into said exhaust conduit, and said second port drains liquid from said conduit into the channel.

10. An apparatus according to claim 8 wherein said at least one air source comprises multiple air sources directing air at respective angles.

11. An apparatus according to claim 8, wherein said grating system receives liquid from the deck.

12. An apparatus according to claim 8, wherein said first port opens through the deck.

13. An apparatus according to claim 8, wherein said first port opens under the deck.

14. A system for evacuating contaminants and water vapor from an area above a swimming pool to an exhaust conduit, the pool being surrounded, at least in part, by a deck, said system comprising: a perimeter deck drain assembly extending around at least a portion of the swimming pool and under the deck, said deck drain assembly comprising: an upper section defining a conduit directing air to the exhaust conduit; a lower section defining a channel collecting and circulating liquid received from the swimming pool, said channel comprising a sidewall and a back panel both connected to a bottom wall to define the channel, wherein said sidewall is connected to the pool, and wherein said back panel connects to said upper section, positioning said upper section in a position that avoids liquid received from the swimming pool; wherein the upper section defines a first port for collecting air from the area above the swimming pool and a second port that directs condensed water vapor into a drain and away from the channel, and wherein said first port and said second port are coplanar within said back panel; a grate covering the lower section, wherein said grate is positioned between said first port and said second port.

15. A system according to claim 14, wherein said first port is separated from water flow by said grate.

16. A system according to claim 14, further comprising at least one air source for directing a flow of air downwardly against and across the surface of the swimming pool, and outwardly towards a perimeter of the deck drain assembly; and an exhaust apparatus for drawing the contaminants and water vapor through the conduit.

17. A system according to claim 14, wherein flowing air from said at least one air source creates a zone for containing contaminants and water vapor substantially above the pool surface; and wherein flowing air directs contaminants and water vapor from the containment zone through said grating system into said at least one conduit and to said at least one exhaust conduit in an air flow direction that is parallel to the deck.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The foregoing and other objects and advantages of the invention and the manner in which the same are accomplished will become clearer based on the following detailed description taken in conjunction with the accompanying drawing in which various embodiments of the invention are depicted.

(2) FIG. 1 is a top plan view of one embodiment of the invention;

(3) FIG. 2 is a top plan view of another embodiment of the invention;

(4) FIG. 3 is a partial perspective view of one embodiment of the invention;

(5) FIG. 4a is a cross-sectional side view of one embodiment of the invention;

(6) FIG. 4b is a partial enlarged view of the embodiment of the invention depicted in FIG. 4a;

(7) FIG. 5 is a partial perspective view of one embodiment of the invention;

(8) FIG. 6a is a cross-sectional side view of one embodiment of the invention;

(9) FIG. 6b is a partial enlarged view of the embodiment of the invention depicted in FIG. 6a;

(10) FIG. 7a is a cross-sectional side view of one embodiment of the invention;

(11) FIG. 7b is a partial enlarged view of the embodiment of the invention depicted in FIG. 7a;

(12) FIG. 8 is a schematic view of one embodiment of the invention;

(13) FIG. 9 is a schematic view of one embodiment of the invention;

(14) FIG. 10 is a schematic view of one embodiment of the invention.

(15) FIG. 11 is a cross-sectional side view of one embodiment of the invention;

(16) FIG. 11A is a front elevation view of the adjustable neck of FIG. 11.

(17) FIG. 11B shows one embodiment of the tray of FIG. 11 with multiple sloped surfaces for draining.

(18) FIG. 12 is a cross-sectional side view of the embodiment of the invention shown in FIG. 11.

(19) FIG. 13 is a front elevation view of an embodiment of the invention utilizing a bench with ports for ventilation.

(20) FIG. 14 is a side elevation view of the bench embodiment shown in FIG. 13.

(21) FIG. 15 is a side elevation view of the bench embodiment of FIG. 14 having modular stackable sections.

(22) FIG. 16 is a front elevation view of the exhaust connection of the bench embodiment of FIG. 14.

(23) FIG. 17 is a side elevation view of the exhaust connection of FIG. 16.

DETAILED DESCRIPTION OF THE INVENTION

(24) The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.

(25) The invention 10 comprises in one embodiment a perimeter deck drain assembly 11 extending around a body of water (e.g., swimming pool 17), at least one conduit 12 positioned substantially adjacent to the deck drain assembly, at least one exhaust conduit 13 for evacuating contaminants and water vapor, and at least one exhaust apparatus 14 for drawing and directing the contaminants and water vapor to a desired area. The embodiments of the invention disclosed herein are adapted to be integrated with an HVAC system associated with standard swimming pool construction as well as standard chloramines evacuation systems.

(26) As shown in FIGS. 1 and 3 the deck drain assembly extends around the swimming pool and includes a bottom panel 15 and two side panels 16A, 16B extending vertically from opposing edges of the bottom panel. The deck drain assembly defines a channel 20 for collecting and circulating liquid (e.g., pool water). A grate or grate sections 21 may cover the channel. The gutter assembly may be formed from any number of materials suitable for pool construction such as concrete, stainless, polyvinyl chloride (PVC), fiberglass, or tile.

(27) The conduit 12 is in communication with the channel 20 and is positioned substantially adjacent thereto. For example, in one embodiment the conduit 12 is secured to one of the side panels 16A, 16B opposite the side panel adjacent to the pool. Stated differently, the conduit 12 may be secured to a back side panel of the deck drain assembly. In one embodiment, the conduit is positioned slightly above the side panels.

(28) It will be understood that the conduit may be formed from any number of materials suitable for construction in connection with swimming pools. For example, the conduit 12 may be formed from polyvinyl chloride (PVC), stainless steel or concrete.

(29) The conduit 12 defines at least one port 22 for directing air and at least one port 23 for directing liquid. It will be understood that any number of ports for directing air and fluid (e.g., water) may be positioned about the conduit and perimeter deck drain assembly. Moreover, the ports 22, 23 for directing air and water may be of varying sizes depending upon the size of the swimming pool and pool facility, and requirements to create a uniform draw to properly evacuate contaminants and water vapor. Depending upon the pool structure, the ports may be formed in the PVC, stainless steel, or concrete forming the perimeter gutter assembly.

(30) Advantageously, the conduit 12 evacuates contaminants and water vapor suspended above a body of liquid (e.g., swimming pool) when a flow of air 24 traveling across the pool surface enters the channel 20 of the perimeter deck drain assembly and the ports 22 for directing air.

(31) As shown in FIG. 10 the exhaust conduit 13 for evacuating the contaminants and water vapor is in communication with the conduit 12. As illustrated in FIG. 10 the exhaust apparatus 14 draws and directs the contaminants and water vapor to a desired area spaced apart from the swimming pool (e.g., an exhaust vent outside of the swimming pool facility).

(32) In one embodiment depicted in FIGS. 4a, 4b, 6a, and 6b the port for directing air 22 is positioned above the port for directing liquid 23. As configured, the port for directing air 22 receives flowing air that is drawn from across the pool surface and into the channel 20 defined by the perimeter deck drain assembly. The port for directing air 22 is positioned above the pool surface and is capable of receiving the flowing air containing contaminants and water vapor from the pool surface as well as from the surface of any water collected in the channel 20. Stated differently, the uniform draw of flowing air from the pool surface necessarily draws contaminants and water vapor from water collected in the channel 20 of the perimeter deck drain assembly (see FIGS. 4a and 6a).

(33) In one embodiment, the port for directing air 22 and the port for directing liquid 23 are substantially coplanar with respect to one another (see FIGS. 3 and 4a). In other words, the two ports 22, 23 are formed in the conduit 12 and back panel 16B of the perimeter deck drain assembly. This particular embodiment is configured for deck drain assemblies wherein a portion of the pool deck 18 extends over the channel of the gutter assembly.

(34) In another embodiment, the port for directing air 22 and the port for directing liquid 23 are substantially perpendicular with respect to one another (see FIGS. 5 and 6a). Stated differently, the port for directing air 22 is coplanar with the pool deck 18 and flowing air containing contaminants and water vapor is drawn through the top of the conduit. This particular embodiment is configured for perimeter gutter assemblies wherein the pool deck 18 is flush or coplanar with the deck drain assembly.

(35) As shown in FIGS. 4a and 6a, the port for directing liquid 23 directs condensed water vapor into the channel. In another embodiment shown in FIGS. 5 and 7a, the port for directing liquid 23 directs condensed water vapor away from the channel, for example, into a drain 25. Advantageously, this configuration provides a self-draining feature to the conduit.

(36) The invention may further include at least one air source 26 for directing a flow of air downward against the surface of the swimming pool 17 as depicted in FIG. 8. As discussed below, it will be understood that one or more air sources may be incorporated into the subject invention to ensure proper evacuation of contaminants and water vapor, and sufficient recirculation of clean air (i.e., air containing minimal amounts of contaminants and water vapor). In one embodiment, one air source 26 (e.g., HVAC duct) is positioned above the swimming pool 17 in a central location with respect to the pool.

(37) In operation, the flowing air from the air source 26 creates a zone 30 for containing contaminants and water vapor substantially above and adjacent to the pool surface (see FIG. 8). The flowing air creates overpressure above the swimming pool surface and forms the containment zone. It is understood that the air above the pool surface containing contaminants and water vapor is denser than the air emanating from the air source. Advantageously, the flowing air directs contaminants and water vapor from the containment zone 30 across the pool surface and through the conduit 12 into the port for directing air 22 to the exhaust conduit 13. In this particular embodiment depicted in FIG. 8, the central location of the air source 26 and the exhaust system draws the air containing contaminants and water vapor across the pool surface in multiple directions in a uniform draw and into the conduit 12 for evacuation by the exhaust system.

(38) The invention may also include one or more of additional air sources 27 for circulating a flow of air substantially adjacent to the containment zone 30 as depicted in FIGS. 8 and 9. The additional air sources 27 may be positioned above the pool deck 18 on opposite sides of the swimming pool facility (i.e., on both sides the central air source 26 positioned directly above the swimming pool 17). As illustrated, the flowing air from the additional air sources maintains the integrity of the containment zone 30 and facilitates circulation of air substantially adjacent to the containment zone 30. By doing so, clean air containing less contaminants and water vapor than in the containment zone is circulated adjacent to the containment zone 30 and adjacent to the airflow emanating from the central air source 26, thereby minimizing contaminants and water vapor (i.e., humidity) in the areas adjacent to the swimming pool.

(39) Advantageously, the subject invention evacuates contaminants and water vapor where it is most heavily concentrated (i.e., above the pool surface) and prevents the contaminants and water vapor from disseminating throughout the swimming pool facility. Conventional systems merely mix and recirculate air containing contaminants and water vapor continuously in an effort to reduce chloramine and humidity levels within the swimming pool facility by dilution. As configured, the present novel invention works in unison with (i.e., balanced with) the HVAC system to reduce the number of air changes per hour (ACH) throughout the entire facility required to maintain safe levels of contaminants and a comfortable level of humidity and air quality. This is accomplished by evacuating contaminants and water vapor directly from the area most affectedi.e., the air in the containment zone 30 immediately above the swimming pool surface. By focusing evacuation in the containment zone 30, fewer number of air changes are required in the areas adjacent to the containment zone. In other words, the apparatus affects an area smaller than the entire area of the facility (i.e., the area immediately above the swimming pool surface) and is capable of increasing the number of air changes per hour (ACH) within the containment zone. By doing so, the apparatus 10 reduces the number of air changes per hour (ACH) required in the areas adjacent to the containment zone.

(40) As depicted in FIG. 9 in an alternative embodiment, the invention may also include yet another air source 28 for directing a flow of air 24 across the surface of the swimming pool 17 from one side of the pool to another. In this embodiment, the additional air source 28 directs a flow of air 24 from one port for directing air 22 to another port for directing air 22 that is positioned opposite thereto. In other words, the additional air source 28 will direct (i.e., sweep) air from one or more ports 22 on one side of a swimming pool, across the pool surface, and into one or more ports 22 on the opposite side of the swimming pool. The flowing air 24 is then directed to the exhaust conduit 13 by the exhaust apparatus 14.

(41) The invention may also include an enclosure 31 for housing the apparatus and swimming pool.

(42) The invention also provides a method for evacuating contaminants and water vapor from an enclosure 31 housing a swimming pool 17. The method includes the steps of directing a flow of air against the surface of the swimming pool, creating a zone of containment 30 for contaminants and water vapor substantially above the swimming pool, and evacuating the contaminants and water vapor across the pool surface. The contaminants and water vapor are directed into the ports 22 defined by the conduit 12 positioned substantially adjacent to the pool surface and into an exhaust system.

(43) In summary, the present apparatus and method provides the following advantageous benefits: reduces the level of contaminants and water vapor in the entire enclosure housing a swimming pool; operates in conjunction with HVAC system to remove contaminants, reduce humidity levels in the facility and thereby improve overall air quality; decreases the amount of heat in the facility; reduces the requirement to operate dehumidifiers within the HVAC system; reduces the number of air changes per hour (ACH) required to maintain safe contaminant levels and reduce humidity within the facility; reduces tonnage (i.e., amount of airflow) required of an HVAC system to recirculate and dehumidify air, and to reduce the concentration of contaminants (e.g., chloramine) within the facility; reduces the operating costs of a HVAC system (i.e., compressor and dehumidifier); and improves energy efficiency resulting from the variable operation of the subject invention (i.e., operates during peak demand when the pool is in use and is idle during off hours when the pool is closed); operates during peak demand or upon demand dependent upon humidity levels in the facility.

(44) Furthermore, the subject apparatus and method decreases the amount of tonnage necessary to circulate and dehumidify air in a swimming pool facility, thereby reducing the size of new enclosures for swimming pools necessary to circulate and dehumidify the air contained therein.

(45) In addition to new construction, the apparatus 10 is also suitable for retrofit applications for existing swimming pool facilities. By retrofitting existing facilities with the novel apparatus, one may be able to reduce the number of dehumidifiers required to maintain comfortable levels of humidity, or at least minimize the operating time of existing dehumidifiers, thereby improving energy efficiency and reducing operating costs.

(46) In the drawings and specification, there have been disclosed typical embodiments on the invention and, although specific terms have been employed, they have been used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth in the following claims.

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(47) In another embodiment set forth in FIGS. 11 and 12, the invention comprises a perimeter deck drain assembly 40 extending around at least a portion of a body of liquid (e.g., swimming pool 17), at least one tray 41 for directing liquid (e.g., water) secured to lower portions of the gutter assembly 40, and a grating system 42 for receiving water. The gutter assembly 40 has two side panels 43a, 43b, an upper section 44, and a lower section 45 all of which define at least one conduit 46 for collecting and circulating liquid. In this embodiment, the deck drain assembly 40 may be constructed substantially adjacent to the body of liquid (i.e., swimming pool). In operation, the conduit 46 evacuates contaminants and water vapor suspended above the body of liquid when a flow of air 24 traveling across the body of liquid enters the grating system 42 and conduit 46. The invention also facilitates evacuation of water vapor and contaminants formed in the conduit 46 when the water is agitated during travel. In this specific embodiment as described in detail below, the deck drain assembly 40 includes a deck drain 47 integral with the evacuation apparatus 10, wherein the deck drain 47 is flush with the deck 18 of the swimming pool 17. As shown in FIG. 11B, the tray may be shaped in any desired configuration to assist in draining and may include variously sloped surfaces.

(48) Advantageously, the upper section 44 of the gutter assembly 40 is adjustable for height and supports the grating system 42. Specifically, the upper section 44 of the deck drain assembly 40 includes an adjustable neck 48. As shown in FIG. 1, the upper section 44 includes a four-sided section 49 having a perimeter that is slightly larger than another portion of the neck. The adjustment feature is shown schematically in FIG. 11A. As configured, the uppermost section of the neck 48 may be adjusted for height depending upon, in one embodiment, the depth of the conduit 46 and the height of a pool deck 18, and then secured to the remaining lower section 45 of the neck 48. For example, tack welds can secure the uppermost section of the neck to the remaining lower section 45 of the neck.

(49) The tray 41 is secured to lower portions of the two side panels 43A, 43B of the deck drain assembly 40. The apparatus may include any number of trays 41 sufficient to form a bottom panel 60 of the assembly. One or more trays 41 may be sloped towards one or more drains such that water entering the grating system 42 and conduit 46 will be directed to the drain for recirculation.

(50) The grating system 42 is positioned against the upper section 44 of the deck drain assembly 40. The grating system 42 includes at least one grate section 55 defining a plurality of openings 56 for receiving liquid or water from a swimming pool deck and a support 57 secured to the upper section 44 of the deck drain assembly 40. The support 57 releasably secures the grate sections 55 to the deck drain assembly 40. The grate sections 55 having openings 56 may be interspersed with grate sections 55 having no openings depending upon the size and shape of the swimming pool and the requirements for providing sufficient recirculation of the water.

(51) The invention may also include at least one support member 58 for supporting the gutter assembly 40. In one embodiment, the support member 58 is secured with rebar to concrete or other material forming the swimming pool.

(52) The invention may also include at least one exhaust conduit 13 for evacuating contaminants and water vapor, and at least one exhaust apparatus 14 for drawing and directing the contaminants and water vapor to a desired area. The exhaust conduit 13 for evacuating the contaminants and water vapor is in communication with the conduit 46 of the deck drain assembly 40. The exhaust apparatus 14 draws and directs the contaminants and water vapor to a desired area spaced apart from the swimming pool (e.g., an exhaust vent outside of the swimming pool facility).

(53) As described earlier, at least one air source 26 for directing a flow of air against the surface of the swimming pool may be provided. In operation, the flowing air from the air source 26 creates a zone 30 for containing contaminants and water vapor substantially above the pool surface. The flowing air directs contaminants and water vapor from the containment zone 30 through the grating system 42 into the conduit 46 and to the exhaust conduit 13. As depicted in FIG. 2, the grating system 42 is flush with the deck surface 18 of the swimming pool 17.

(54) As previously discussed, this embodiment may also include at least one air source 28 for directing a flow of air 24 across the surface of the swimming pool 17. This embodiment may further include at least another air source 27 for circulating a flow of air substantially adjacent to the containment zone 30, such that the flowing air maintains the integrity of the containment zone and facilitates circulation of air substantially adjacent to the containment zone.

(55) This particular embodiment may also include an enclosure 31 for housing the apparatus and swimming pool.

(56) A method incorporating this latest embodiment is also provided. The method includes the steps of directing a flow of air against and/or across the surface of the swimming pool, creating a zone of containment for contaminants and water vapor substantially above the swimming pool, and evacuating the contaminants and water vapor across the pool surface, into at least one conduit 46 positioned substantially adjacent the pool surface, and into an exhaust system.

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(57) The invention includes yet another embodiment in which the ports for evacuating contaminants and water vapor are conveniently implemented in the form of a deck bench as illustrated in FIGS. 13-17. The bench provides a seat around the perimeter of a body of liquid, such as a swimming pool. The front section 65 of the bench assembly 70 defines ports 22 that receive air flow from just above the surface of the liquid. Similar to the embodiments noted above, the ports direct contaminants and water vapor to the appropriate exhaust removal system and drainage system. Air enters a conduit defined by edges of the bench assembly 70 through the ports 22 and exits through an exhaust connector 68 to the appropriate exhaust removal and handling system.

(58) FIG. 14 shows the air flow entering a respective port 22, and one should note that the air flow may be controlled in any of the ways described above for other embodiments of this invention so long as contaminants and water vapor efficiently enter the conduit defined by the bench assembly via the ports 22. Accordingly, the invention may further include at least one air source 26 for directing a flow of air downward against the surface of the water in a swimming pool 17 as depicted in FIG. 8 to push water vapor and contaminants into the ports 22 defined by the bench assembly 70. As discussed above, it will be understood that one or more air sources may be incorporated into the subject invention to ensure proper evacuation of contaminants and water vapor and sufficient recirculation of clean air (i.e., air containing minimal amounts of contaminants and water vapor).

(59) FIG. 15 shows that the bench assembly 70 may be formed of modular sections 70A, 70B, 70C for stacking and easy storage. The sections incorporate connectors (e.g., standard draw catches) that allow the sections to fit together tightly, and a gasket 67 may fit between connected sections to seal the sections together. Each section may also include a rubber foot 69 for sealing the bench assembly 70 to the floor (i.e., a floor seal). Overall, the sections 70A-70C fit to each other and to the floor adjacent a body of liquid to create an air tight enclosure that is connected to an exhaust removal system by an end piece 68 as shown in FIGS. 16 and 17. The exhaust removal system may be configured to provide a negative pressure level that actually sucks the contaminants and water vapor into the appropriate exhaust removal mechanisms.

(60) So long as the ports 22 are accessible to the air flow above the body of liquid, the system will efficiently transport contaminants away from the liquid. The bench assembly may be sized as appropriate for the amount of contamination to be removed (e.g., sections of 16 inches by 16 inches allow for 256 square inches of air flow). The body of the bench assembly 70 and its component sections 70A-70C may comprise any materials that are convenient for manufacturing the sections and that can withstand the pressures used in the system. Bench assemblies of molded plastics or shaped metals are within the scope of the invention described herein. The number of ports 22 and the number of sections 70A-70C may be adjusted to fit the use at hand. The bench assembly may be placed in one or more regions around the body of liquid or may encompass the entire perimeter of the body of liquid.

(61) In the drawings and specification, there have been disclosed typical embodiments on the invention and, although specific terms have been employed, they have been used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth in the following claims.