Air System Equipment Registers Grilles Air Control Products, Inc.

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TABLE 2 Classes of Particulate Filters Classes of Filters Initial AP (> Rated Capacity (In Inches) Typical Size (In Inches) Typical Rated Flow (In CFM) NBS Atmospheric AFI Stain Artificial Approximate Efficiency Weight Element (In Per Cent) (In Per Cent) Cost Viscose (oiled) Fibrous, Impingement (Common Furnoce Filter) Viscose (oiled) Metallic, Impingement **Dry, Fibrous Low-Medium Efficiency .08-. 12 WG 24 x 24 x 2 .08-.12 WG 24 x 24 x 2 24 x 24 x 29 .20*.4 WG 24 x 24 x 11 2500 2500 2000 5-12 5-12 50-55 65-75 65-75 100* .25-2.00 $8-512 $25-$35 **Dry, Fibrous Medium Efficiency 24 x 24 x 29 .20-.50WG 24 x 24 x 11 Vi 2000 80-85 100* $25-$40 *Dry, Fibrous High Efficiency 24 x 24 x 29 .35-.60 WG 24 x 24 x 11'/, 2000 90-95 100* $25-545 Dry, Fibrous Hospital Type .30-.50 WG 24 x 24 x 11 Vi 1000 100* 100* $50-590 Dry, Fibrous, High Inter ception High Efficiency Particulate Air Filter .70-1.2 WG 24 x 24 x 11 Vi 1000 100* 100* $60-$100 'Essentially 100 per cent--Evaluation method not sufficiently critical to detect penetration.

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