An air filter assembly and use thereof for filtration of air in wet or damp conditions, said air filter assembly comprising: an air filter comprising a front frame defining at least one rectangular aperture for receiving an air flow to be filtered; characterized in that said air filter assembly comprises a deflector element extending alongside edge portion of the rectangular aperture and adapted an to deflect an air flow passing through the rectangular aperture away from an adjacent inside surface of the air filter; and a liquid drain arranged such that liquid collected at said adjacent inside surface of the air filter can exit the air filter through said liquid drain.

A filter holding device includes an opening portion and a filter. The opening portion communicates an inside of the filter holding device with an outside of the filter holding device. The filter includes a first side and a second side. The first side faces the inside of the filter holding device. The second side faces the outside of the filter holding device. The filter has a lower weight density per unit volume at the first side than at the second side. At least a side face of the first side of the filter is covered with an air-impermeable member. The side face is a lateral face of the filter at the first side.

An indoor external air filtering and fragrance diffusing system composed of a cage like apparatus that attaches to an existing air vent and holds in place air filter. The present invention includes a device to hold a filter from the exterior of a conventional air vent, allowing the airflow into a room from the central air system and a customized air filter. The present invention incorporates a variety of air filters that can be adapted to the specific needs of a user. One variation of the filter contains an embodiment that is comprised of absorbent material where a fragrance of choice can be added. Yet another variation of the filter contains an embodiment of absorbent material that already contains fragrance.

The facility includes a first connection mechanism connecting a filter unit to a floor discharging section to establish communication between an opening portion of the floor discharging section and an upper face opening portion of the filter unit and a second connection mechanism connecting the filter unit to an exhausting chamber to establish communication between an opening portion of the exhausting chamber and a side face opening portion of the filter unit. The first connection mechanism includes a seal portion that comes into contact with an entire circumference of an outer face of an upper end portion of the filter unit, thus preventing leakage of exhaust gas. The seal portion includes an introducing portion for introducing the upper end portion of the filter unit to the seal portion from a horizontal direction.

A vehicle including at least one filter for trapping particles in a vehicle's outside surrounding air. The filter includes a first part and a second part. The first part includes a first cilia layer. An air inlet is arranged in one end of the filter. The first cilia layer is arranged to trap at least some particles in the air flowing into the filter via the air inlet when the first cilia layer is electrostatically charged by an electromagnetic field. The filter is connected to a vehicle chassis and such that one of the first and second parts faces the vehicle chassis and the other part faces ground.

An air conditioner of the present disclosure includes a fan filter unit whose power consumption efficiency determined by the following equation is 600 kWh/(m.sup.2.Math.yr) or less when the fan filter unit is operated in such a manner that blowing efficiency η of a fan is 0.75. In the following equation, Q represents a nominal flow rate (m.sup.3/sec) of an air filter unit, ΔP represents a pressure loss (Pa) of the air filter unit measured when air passes through the air filter unit at the nominal flow rate of the unit, and S represents an opening area (m.sup.2) of the air filter unit. Equation: power consumption efficiency kWh/(m.sup.2.Math.yr)={(Q×ΔP)/(η×1000)}×(24×365)/S. The air conditioner of the present disclosure is suitable for reducing power consumption even when including the air filter unit which is large in size and has high filtration performance. An air filter unit of the present disclosure is suitable for the air conditioner of the present disclosure.

A portable air filter and method of use are provided. The portable air filter includes a semi-permeable air filter, optionally disposed within a frame. An attachment surface, such as an adhesive, is disposed on the frame, for attaching the portable air filter to an air vent. In certain embodiments, a second air filter and frame are slidably connected to the frame. If the portable air filter is not disposed within a frame, the portable air filter is cut to fit over an air vent, and an adhesive, such as tape, is provided for a user to attach the cut filter to fit over the air vent. The method includes attaching the portable air filter to an air vent by pressing the adhesive to a wall, ceiling, or floor such that the portable air filter covers the air vent. The invention is useful for improving air quality in a variety of spaces, including in an airplane, in a hotel, on a cruise ship, on a travel bus, and other public spaces.

A filter media and methods are provided. The media is stretchable and exhibits a high degree of elongation which thereby extends its surface area during pleating. By extending surface area of media during pleating, the initial differential pressure is lowered as the area of media is stretched while keeping the same efficiency range with a compressed thickness of media on the affected area.

A filtration element assembly for use with a cylindrical filter casing has a prismatic support body with a support body interior space. The side walls of the support body form a polygonal outer cross-sectional shape defining a circumscribed circle with a diameter less than or equal to the casing diameter. At least one side wall has an inlet flow passage with a receiving channel surrounding it. A porous filtration structure is disposed within the receiving channel so as to cover the inlet flow passage. A clamping member attached to each of the at least one side wall has a framing portion and a flange portion. The framing portion has a flow window formed there-through in registration with the inlet flow passage. The flange portion extends from the framing portion and is sized and configured for reception into the receiving channel to engage and retain the filtration element within the channel.

A surface cleaning apparatus includes first and second pre-motor filters that are in parallel.