Card Case Glass Panel Filter Available in sizes: - 620x495mm / 25"x20" - 620x395mm / 25"x16" - 595x595mm / 24"x24" - 595x495mm / 24"x20" - 595x295mm / 24"x12" - 495x495mm / 20"x20" - 495x395mm / 20"x16" - 495x375mm / 20"x15" - 445x445mm / 18"x18" - 375x375mm / 15"x15" - 295x295mm / 12"x12" - 250x250mm / 10"x10" Depth : - 22mm / 1" - 47mm / 2" - 95mm / 4" Description : - Frame is manufactured from heavy duty card - Supporting card lattice on both faces - Filter media encapsulated between lattice faces - All Dust Spares panel filter adhere to stringent test standards which follow two parts Arrestance and Efficiency. Arrestance Test - covers low to medium grade filters and is known as the A.S.H.R.A.E. 52-76 Synthetic Dust Weight Arrestance Test. The test dust is a blend of 3 different types of dust which are fed to the filter at a known and controlled rate. Efficiency Test - covers a staining test that gives a value known as The Average Atmospheric Dust Spot Efficiency. The test solely employs atmospheric contaminants and is therefore an excellent guide as to the actual amount of Staining Contaminant the filter will retain. This product is non returnable - please see our Terms & Conditions If you have any questions about this product or if you do not find what you are looking for please feel free to call us on 03456 800 696 and we will be happy to help.
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