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 modular filter for ventilation air vents comprises a filtering fabric roll (1) housed within a casing provided with anchoring means (13) engaging the surface (S) of the container which has the air intake port (B) to be filtered; the casing has a slot (9) for extracting the filtering fabric (T), and has a casing (4) comprised of a shaped wall (5) enclosed at the ends by covers (10, 40, 44, 51) or end supports (7, 47) of this wall having a shape corresponding to the shaped wall (5) and maintaining a longitudinal slot (9) at the front edges of the shaped wall to allow the passage for the extraction of the front (F) of the filtering fabric (T) unwound from the filtering fabric roll (1); at least one screw stay rod (8, 54) is placed between two covers (51) or end supports (7, 47) of the shaped wall and is tightened to define the proper distance between the two end supports or covers (51), by tightening the end supports (7, 47) or covers (51) to the shaped wall (5), one at each end, to close the access to the casing, and containing the filtering fabric roll (1) floating and free to rotate when the filtering fabric is dragged from the outside of the modular filter. Various methods for producing the shaped wall (5) and finalizing the casing (4) of the modular filter are indicated.

An air filter system in accordance with the present invention includes a filter housing that defines an airflow channel. A supply roll of a filter medium, and a take-up roll for receiving the filter medium from the supply roll are positioned parallel to each other in the airflow channel. A plurality of wire mesh diverter-screens are positioned between the supply roll and the take-up roll to establish a tortuous path for statically positioning the filter medium across the airflow channel. Periodically, the take-up roll can be rotated to draw replacement filter medium into position on the tortuous path.

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.

A regenerative filter having a length of filter material, first and second perforated filter supports, a filter regenerator, and an intermediate duct, a first end of the filter material being wound around the first perforated filter support to form a first scroll type filter through which air to be filtered can pass, a second end of the filter material being wound around the second perforated filter support to form a second scroll type filter through which air to be filtered can pass, the filter material is movable in both directions between the first and second perforated filter supports by passing a single layer of filter material through the filter regenerator as it moves between them, the intermediate duct being arranged to take airflow which has passed through the first scroll type filter to the second scroll type filter for filtration during use of the regenerative filter.

The present invention relates to a regenerative filter comprising, a length of material having a first support tail and a filter portion, a first end of the material being wound around a first perforated support to form a first scroll type filter through which air to be filtered can pass, and a second end of the material being fixed to a filter support, the regenerative filter being arranged such that the material is movable in both directions between the first perforated support and the filter support, passing through a filter regenerator generator as it moves between them, the first end of the material forms the first support tail which extends from the first perforated support to at least the filter regenerator when the material is unwound from the first perforated support, the first support tail having a more open structure than the structure of the filter portion.

An air filter system in accordance with the present invention includes a filter housing that defines an airflow channel. A supply roll of a filter medium, and a take-up roll for receiving the filter medium from the supply roll are positioned parallel to each other in the airflow channel. A plurality of wire mesh diverter-screens are positioned between the supply roll and the take-up roll to establish a tortuous path for statically positioning the filter medium across the airflow channel. Periodically, the take-up roll can be rotated to draw replacement filter medium into position on the tortuous path.

A control unit is provided for monitoring the efficacy of an air filter in the ducting of an operating HVAC system. Specifically, the control unit monitors airflow velocity in the ducting to evaluate and control the power requirements that are necessary for the HVAC system to maintain a constant airflow velocity in the ducting of the system. In accordance with the present invention, the power requirements are measured and evaluated during the duty cycle of an air filter, to thereby determine when the air filter needs to be removed or replaced.

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.

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.