The filters incorporate a 100% synthetic media with an ASHRAE 52.1 average atmospheric efficiency of 30% to 35% and an average arrestance exceeding 90% by weight. The 1 inch and 2 inch filters handle velocities of up to 500FPM, the 4 inchfilters up to 625FPM.
DESCRIPTION
The filters use mini-pleated wet laid glass media with efficiency of 99.99%(HEPA) on 0.3¦Ìm particle size or 99.9995%(ULPA) on 0.1 to 0.2¦Ìm particle size. Designed for easy installation and longer service life. The media pack is available in a 40mm with a frame depth of 50mm and a 55mm version with a frame depth of 65mm.
The HEPA filter is constructed with a 16 gauge galvanized or stainless steel or wooden frame with a continuous band of media pleated back and forth over corrugated aluminum separators. (more…)
If you want to buy some hepa, you need know the spec as following:
1. efficiency
2. air volume
3. initial press drop
4. material of frame
5 . gasket : single side or double side