The present invention relates to an air filter housing for supplying air to a space, said air filter housing being configured to be arranged in a ceiling of said space, said housing having a mouth facing downward, said mouth comprising a sealing surface configured to receive a panel type air filter comprising a frame and a filter medium held within said frame, such that a sealing connection between said sealing surface and said frame is achieved, characterized in that said filter housing further comprises at least one resilient member arranged below the sealing surface such that when a panel type air filter is inserted into the mouth, the resilient member will be deformed by the filter frame as the filter passes the resilient member, and resume its original shape once the filter has passed, such that the filter is retained between the sealing surface and the resilient member. The present invention further relates to the use of a filter housing in a cleanroom, and to a method of mounting a panel type air filter in an air filter housing.

A smoke filter includes a housing formed with an upper casing and a lower casing. A filtration passage with a bending section is formed between the upper casing and the lower casing and further, a replaceable filtration cloth device is provided in the interior of the housing and the filtration cloth of the replaceable filtration device passes through the filtration passage. By so designing, the smoke filter of this invention is able to increase a filtration area, enhance filtration efficiency and diminish the size of the housing and further, the smoke filter of this invention is simple in structure and convenient in maintenance and in replacement of the filtration cloth.

The invention is directed to replacement media advancing air filter in air handling units with a flow channel. The filter having a housing and an exposure slot with filter media storage area that has an unexposed pleated, folded filter media portion stored therein. The filter media portion being folded and stacked in and compactly held at least in part within the storage area. A motor is coupled to a power supply and in communication with a controller. The motor moves a movement member that moves a portion of the filter media from a stored state in the storage area into the exposure slot and is exposed to the air in the air flow channel creating an exposed portion of the filter media. The exposed portion is collected within a containment area as a further portion of media is moved into the exposure slot to replace the exposed portion therein.

A filter element comprising a media pack and a seal, the seal being directly or indirectly connected to the media pack in a sealing manner, the filter element comprising a longitudinal axis, wherein the seal extends along a closed loop trajectory; and wherein the seal defines a predetermined sealing direction with respect to the longitudinal axis along the closed loop trajectory; wherein the predetermined sealing direction is not constant along the loop trajectory; and wherein, in at least one seal portion, the seal direction is not parallel with a sidewall, upper wall or lower wall of the filter element or media pack; and a filter assembly comprising the filter element.

The present invention discloses a prefiltration structure for filter element and an air purifier, comprising: a first transmission belt, a second transmission belt, a first transmission gear, a prefiltration belt having opposing windward and leeward portions, and a driving member. The prefiltration belt is arranged at a side of a filter element to pre-filter the air entering the filter element, thereby reducing the frequency of cleaning or replacement of the filter element. When impurities are accumulated on the windward portion of the prefiltration belt, the driving member outputs power to drive the first transmission belt and the second transmission belt to rotate synchronously, thereby driving the prefiltration belt to rotate simultaneously. Meanwhile, a scraping member scrapes off the impurities accumulated on a surface of the prefiltration belt into an accommodation chamber, so that the prefiltration belt is cleaned.

An automatic HVAC filter change system is disclosed herein. The automatic HVAC filter change system changes filters automatically by way of a design configured to seamlessly move and change filters while on an automated schedule. The automatic HVAC filter change system provides notification and reminders for when it is done.

A filtering apparatus includes an exhaust pipe, multiple air exhaust devices, a conveyor, a filtering net, a tank washing device, and a cleaning device. The exhaust pipe includes multiple air outlets. The air exhaust devices align with the air outlets respectively. The conveyor includes a first delivery circuit extending through the air outlets and a second delivery circuit connecting the first delivery circuit. The filtering net extends through the first delivery circuit and the second delivery circuit. The tank washing device is arranged in the second delivery circuit and includes a liquid tank. The cleaning device is mounted in the tank washing device and includes multiple rolling shafts each provided with multiple brushes. The filtering net is moved between the first delivery circuit and the second delivery circuit to perform two-stage purifying circulation to drain a purified gas from the air exhaust devices.

An automated air filter comprises a frame, a plurality of reels mounted on the frame such that the reels are rotatable, a filter sheet extending between the reels and across the frame, and an actuator configured for rotating one or more of the reels. The automated air filter can automatically prevent accumulation of debris and avoid clogging, with little or no effort by the owner or user.