Typical HVAC Filters

Fiberglass Filter:Typically manufactured using medium to heavy cardboard frame with layered fiberglass reinforced with a metal mesh for support from collapse. Used in most HVAC filtration applications.

Polyester Filter Media Pad: Polyester offers higher resistance and dust holding capabilities than most fiberglass filters.  Frequently used to replace fiberglass filters, which can fragment and send fibers into the air stream. Used in most HVAC filtration applications.

Electrostatic Filter: These filters create a self-generated charge helping to collect dust particles.  These filters are typically manufactured using multiple layers of polypropylene media or similar within a galvanized frame or cardboard frame.

A second category also is comprised of single-use, disposable filters called HEPA filters. By definition, a HEPA filter is a throwaway, extended-medium, dry-type filter with: (1) a minimum particle removal efficiency of no less than 99.97 percent for 0.3-µm particles, (2) a maximum resistance, when clean, of 1.0 inches water gauge (in.wg) when operated at 1,000 cfm, and (3) a rigid casing that extends the full depth of the medium   [Note: Filters of different flows and resistances are allowable by the AG-1 Code. 2 A filter of identical construction and appearance, but having a filtering medium with a retention of 99.9995 percent for 0.1 µm particles, is referred to as an ultra-low penetration aerosol filter (ULPA). The filtering medium of HEPA filters is thinner and more compressed, and contains smaller diameter fibers than HVAC filters. HEPA filters are widely used throughout industry.Of cause,Suita is also a good filter supplier.http://www.suitafilter.com