Compound air filter and method of removal of contaminants
An apparatus and a method are provided for a heating, ventilation, and air conditioning (HVAC) air filter to remove airborne molecular contaminants and volatile organic compounds (VOCs) from air within building spaces. The air filter comprises a support frame having a shape and size suitable to orient the air filter within a HVAC system. A compound filter medium is retained within the support frame to remove the airborne molecular contaminants and VOCs from air flowing through the HVAC system. A portion of the first media layer is pleated and may comprise a combination of media layers configured to exhibit a relatively high filtration efficiency and a low air pressure drop across the filter medium. A second portion of the filter medium is coupled to the first portion and maintains a uniform distribution of the pleats with the first portion.
1. A method for an air filter to remove airborne contaminants from air within a building, comprising:
forming a first media layer;
arranging a substantially uniform distribution of pleats in the first media layer;
applying embossed shapes to maintain a shape and a spacing of the pleats wherein the embossed shapes are aligned and disposed in a parallel direction with airflow such that adjacent pleats contact one another and each pleat includes a plurality of opposing embossed shapes protruding therefrom;
coupling a second media layer to the first media layer, forming a compound filter medium wherein the first media layer and the second media layer includes embossed shapes disposed in a parallel direction with airflow and between adjacent pleats;
adhering a woven, fibrous material to a down-stream side of the first media portion, with respect to the direction of airflow;
incorporating one or more support layers into the filter medium to impart structural integrity to the air filter wherein the support layer has at least a wire mesh that is co-pleated and configured to provide reinforcing support;
retaining at least one of the first media layer, the second media layer, and the one or more support layers within a support frame;
coupling a wire mesh with the first media layer; and
configuring the support frame to be received by a HVAC system.
2. The method of claim 1 , wherein forming the first media layer includes selecting a filter material comprising any of paper, foam, cotton, spun fiberglass, a woven synthetic or natural material, or any combination thereof.
3. The method of claim 1 , wherein applying the embossed shapes includes applying adhesive strips to maintain the shape and the spacing of the pleats.
4. The method of claim 1 , wherein coupling the second media layer includes using an adhesive to join the first media layer to the second media layer.
5. The method of claim 1 , wherein incorporating the one or more support layers includes configuring the one or more support layers to resist deformation of the pleats.
6. The method of claim 1 , wherein configuring the support frame includes configuring a shape and a size of the support frame that accommodates the HVAC system.
7. The method of claim 1 , wherein retaining includes extending a molded rim around a perimeter of at least the first media layer.
8. The method of claim 1 , wherein coupling the second media layer includes selecting a filter material comprising any of a woven synthetic layer, a woven cotton layer, or any combination thereof.
9. The method of claim 1 , wherein coupling the second media layer includes incorporating an electrostatic component into the air filter.