Gas-Permeable Structure with Chemically-Reactive Coating
A filter with a frame and media is disclosed for removing chemical substances from air or other gas. The media has multiple slit and expanded sheet layers, or other air-permeable layers, with molecular catalyst material mounted on one or more of the layers. The air or other gas flowing through the media makes sufficient contact with the catalyst to chemical react substances therein with the catalyst to remove or greatly reduce the substances. This can be used to remove or reduce odors, formaldehyde or any other substance without substantial pressure drop due to the large openings in the layers. The layers may be pleated to give strength to the media.
1 . A filter comprising:
(a) an air-pervious filtration media mounted within a frame, the media including at least one sheet layer having a plurality of openings through which air may pass without substantial pressure drop; and
(b) a plurality of granules mounted to the at least one sheet layer in a dispersed configuration, the granules reacting with at least one substance in the air when the at least one substance contacts the granules while passing through the media, thereby changing the chemical makeup of the air without removing substantial particulate from the air.
2 . The filter in accordance with claim 1 , wherein the at least one sheet layer further comprises a plurality of sheet layers, each sheet layer having a plurality of openings through which air may pass without substantial pressure drop.
3 . The filter in accordance with claim 2 , wherein each of the plurality of sheet layers has a plurality of granules mounted thereto in a dispersed configuration, the granules reacting with at least one substance in the air when the at least one substance contacts the granules while passing through the media, thereby changing the chemical makeup of the air without removing substantial particulate from the air
4 . The filter in accordance with claim 3 , wherein the openings in the plurality of sheet layers are formed by slitting and then expanding the sheet layers prior to mounting the plurality of granules to the sheet layers.
5 . A filter comprising:
(a) an air-pervious filtration media mounted within a frame, the media including a plurality of sheet layers, each of the sheet layers having a plurality of openings, which are formed by slitting and then expanding the sheet layers, through which air may pass without substantial pressure drop, wherein the sheet layers are pleated to form at least a first substantially planar panel having a first edge joined at a predetermined, non-parallel angle to a first edge of a second substantially planar panel; and
(b) granules mounted to at least one of the sheet layers in a dispersed configuration, the granules reacting with at least one substance in the air when the at least one substance contacts the granules while passing through the media, thereby changing the chemical makeup of the air without removing substantial particulate from the air.
6 . The filter in accordance with claim 5 , wherein at least one of the sheet layers comprises aluminum.
7 . A method of forming an air filter, the method comprising:
(a) slitting and expanding a plurality of sheets of aluminum;
(b) mounting molecular catalyst granules to the slit and expanded sheets of aluminum, the granules configured for reacting with at least one substance in the air when the at least one substance contacts the granules;
(c) maintaining said plurality of sheets in an inventory;
(d) removing at least one sheet from the inventory and pleating the at least one sheet to form at least a first substantially planar panel having a first edge joined at a predetermined, non-parallel angle to a first edge of a second substantially planar panel;
(e) mounting a frame around said at least one sheet after pleating.
8 . The method in accordance with claim 7 , further comprising passing the air through the at least one sheet, thereby changing the chemical makeup of the air without removing substantial particulate from the air.