The invention relates to a safety workbench (1) having a work space (3) surrounded by a housing (2) having a work opening (6) located in the housing front side (4) and adjustable with an adjustable front panel (5) for admitting into the work space (3) an air inlet flow (7), an exhaust blower (8) and a circulating air blower (9) for conveying an air flow (10) in the safety workbench (1), which are designed such that a partial air flow drawn in by the exhaust blower (8) is filtered through an exhaust air filter (11) as exhaust air flow (12) from the safety workbench (1) and a partial air flow drawn in by the circulating air blower (9) through a circulating air filter (13) as downwardly directed circulating air flow (14) into the work space (3), and a control device (15), a differential pressure sensor (16) and two pressure transducers (17, 18) connected thereto which are designed to measure a pressure at two different positions within the safety workbench d, wherein a first of the pressure sensors (17) is arranged in the immediate vicinity of the fan blades (90) on the low pressure side (91) of the circulating air blower (9) and a second of the pressure sensors (18) is arranged in a low-flow area, (20) on the low pressure side (91) of the circulating air blower (9). The invention further relates to a method of operating a safety workbench according to any of the preceding claims, comprising the steps of: a) determining a pressure difference between the first pressure transducer (17) and the second pressure transducer (18) by means of the differential pressure sensor (16), b1) comparing the pressure difference determined in a) with a nominal pressure difference stored in the control device (15), which corresponds to a nominal volume flow, or b2) converting the pressure difference measured in a) into an associated volume flow and comparing the calculated volume flow with one nominal volume flow stored in the control device (15), and c) regulating the circulating air blower (9) such that the nominal volume flow is conveyed.

A fume hood adapted to be connected to an exhaust system has a ventilated chamber having an access opening, and at least one horizontally sliding sash or panel at the access opening that is configured to cover and uncover portions of the access opening. Each horizontally sliding panel has a peripheral edge that convexly curves into the chamber towards a centerline of the at least one horizontally sliding panel. In some embodiments, the peripheral edge is convexly curved in an arc of between about ninety degrees and about one hundred eighty degrees (90-180). The exhaust system creates air flow into the chamber and the curved peripheral edge produces controlled air flow patterns into the chamber. The curved edge is aerodynamically designed to help shed vortices and prevent accumulation of concentrations on the inside edge of the each panel typical of conventional fume hood sashes/panels.

Embodiments of the invention provide an intake apparatus for a local ventilation system. According to at least one embodiment, the intake apparatus includes a connection opening, a hood configured to connect an intake opening larger than the connection opening, an intake duct coupled to the hood while communicating with the connection opening, and an intake fan which is installed at a peripheral portion of the intake opening so as to generate an intake air current in the direction of the connection opening. According to at least one embodiment, the intake fan is provided multiple in number in the circumference direction of the intake opening to generate an intake air current flowing from the intake opening to the connection opening, and a mixed flow prevention body is formed protruding in a partition shape from the intake opening to the intake duct along the inner side of a corner of the hood, and a plurality of lattice exhaust guide flow passages are disposed on straight lines and are isolated from each other, and an air current alignment lattice is installed in the inner space of the intake duct for the lattice exhaust guide flow passage to be disposed in the longitudinal direction of the intake duct.

The present invention relates to a fume cupboard 1 for a laboratory, which fume cupboard has a housing 60 in which a work area is located, delimited in the front by a front sash 30, at the bottom by a bottom plate 34 and on each side by a side wall 36. The fume cupboard 1 further comprises a first hollow profile 10, 10 disposed on a frontal end face of each side wall 36, wherein each first hollow profile 10, 10 contains a first pressure chamber 10b, 10b which is in fluid communication with a multiplicity of first openings 10d, 10d, from which air jets in the form of wall jets 100 consisting of compressed air may be output into the work area along the respective side wall 36. The fume cupboard is characterized in that the size of the first openings 10d, 10d and the air pressure that prevails in the first pressure chamber 10b, 10b during proper user of the fume cupboard are selected such that the first pressure chamber 10b, 10b can be connected fluidically to a compressed air system 74 installed in the building without causing airflow delamination of the wall jets 100 from the side wall 36 in a region extending from a front side of the work area at least as far as 25% of the depth of the work area.

The present invention further relates to a fume cupboard in which a hollow profile 20, 20 of such kind is disposed on a front frontal end face of the bottom plate 34.

The present invention relates to a fume cupboard 1 available for a laboratory space, which has a housing 60, in which a work space is located, which is limited on its front side by a front sash 30, on its base by a base plate 34 and by a side wall 36 on each of its sides. Furthermore, the fume cupboard comprises a first hollow profile 10, 10 arranged on a front side of each side wall 36, wherein each hollow profile 10, 10 has a first pressure chamber 10b, 10b, which is fluidically connected to a plurality of first openings 10d, 10d, out of which air jet streams in the form of wall jet streams 100 consisting of pressurised air can be emitted along the respective side wall 36 into the work space. The fume cupboard is characterized in that at least one of the first openings 10d, 10d is fluidically connected to the first pressure chamber 10b, 10b via a first longitudinal duct 10c, 10c, and that the first duct 10c, 10c has a length L in the direction of flow that is at least three times the hydraulic diameter of a cross-sectional surface of the first opening 10d, 10d, from the perspective perpendicular to the direction of flow in order to prevent flow displacement of the wall jet stream 100 coming out of the first opening 10d, 10d of the side wall 36 in an area of the front side of the work space up to at least 25% of the depth of the work space. Furthermore, the present invention relates to a fume cupboard, where such a hollow profile 20, 20 is arranged on a front side of the base plate 34.

Apparatus for effecting safe handling of biological and/or chemical materials, the apparatus comprising: a housing enclosing a workspace, wherein the housing comprises an opening for accessing the workspace; a sash mounted to the housing, the sash being configured to move between a closed position in which the sash covers the opening of the workspace and an open position in which the sash does not cover the opening of the workspace; a ventilation system disposed in the housing for drawing air out of the workspace; a motor for moving the sash between the open position and the closed position; an external power source for operating at least one of the ventilation system and the motor; and a secondary power source for operating at least one of the ventilation system and the motor when the external power source cannot deliver power to operate at least one of the ventilation system and the motor.

Apparatus comprising: a fumehood; and an air treatment device for purging unwanted substances from the exhaust air of the fumehood, the air treatment device comprising: a non-thermal plasma reactor stage for producing air byproducts comprising O., N., OH. and O.sub.3 and introducing those air byproducts into the exhaust air of the fumehood so as to treat the exhaust air of the fumehood; and a catalyst stage downstream of the non-thermal plasma reactor stage for further treating the air downstream of the non-thermal plasma reactor stage.

The local air cleaning apparatus 1 causes a cleaned uniform air flow blown out from an air flow opening face 23 to collide with an air collision face W to flow outside an open region, so as to cause cleanliness to be higher inside a guide 3 and inside the open region than other regions. Additionally, the apparatus 1 includes at least one of a device for measuring pressures inside the guide 3 and inside a push hood 2, a device for measuring the cleanliness inside the guide 3 or of the open region, and a device for measuring a gap area between the guide 3 and the air collision face W, and, to ensure the cleanliness from a result of the measurement, controls such that a flow velocity of the cleaned uniform air flow blown out from the air flow opening face 23 can be decelerated or accelerated.

A fume hood comprising: a hood, a work chamber, and a front wall formed with an opening toward an indoor environment; an air supply system, and an air exhaust system to discharge air that enters the work chamber through a front opening and enters the work chamber through the air supply system, out from the work chamber; the air supply system provided with at least one air supply outlet in an upper portion and a lower portion of the hood, and the air supply outlet supplying air towards the work chamber. The fume hood can reduce energy consumption of air conditioning and suppress overflowing of harmful substances in the work chamber, with a low installation cost and a high consistency of product quality.

Systems, devices and methods provide energy recover, modular systems to build and revise commercial kitchen services, closed circuit exhaust, and high efficiency capture and containment of fumes from cooking processes.