Multiple layers of expanded Galvanized Steel, enclosed in a medium weight Galvanized Steel frame. Designed as a less expensive option for air applications such as make up air roof top units in industrial, commercial, restaurants, schools, and office buildings where a washable filter is recommended. They can also be used as pre filters, which would remove large particles that easily clog a filter. Pre filters keep the main filter lasting longer and the unit running more smoothly.

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CONSTRUCTION: The Perm A Steel Filter is a lightweight galvanized filter. It consists of multiple layers of galvanized expanded material, expanded through specific feeds to assure maximum filtering and internal loading capabilities. The media is enclosed in a lightweight galvanized frame, mitered and secured at one corner by rivets. The filter is designed for applications such as light industrial, commercial, restaurants, schools, and office buildings where a lightweight permanent filter is recommended. Maximum temperature range on the Perm A Steel Filter is 425 degrees F. Available in both stock and special sizes. Available in 3” and 4” thicknesses.


MATERIAL: Filtering element shall be processed from sheet steel commercially known as hot dip galvanize, no less than .0157 in thickness expanded through no less than .020 feed. Frame shall be made from hot dip galvanize steel.

Note: All Smith Permanent stock sizes are 1/2″ under on width and height, 1/8″ under on thickness.

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(Actual Size
1/2″ under)
Pack Ctn/
Lbs. Ctn
16 x 20 x 1PS16201N12
/42 lbs.
16 x 25 x 1PS16251N12
/54 lbs.
20 x 20 x 1PS20201N12
/54 lbs.
20 x 25 x 1PS20251N12
/64 lbs.
24 x 24 x 1PS24241N12
/73 lbs.
10 x 20 x 2PS10202N12
/33 lbs.
12 x 24 x 2PS12242N12
/46 lbs.
16 x 20 x 2PS16202N12
/51 lbs.
16 x 25 x 2PS16252N12
/59 lbs.
20 x 20 x 2PS20202N12
/59 lbs.
20 x 25 x 2PS20252N12
/70 lbs.
24 x 24 x 2PS24242N12
/81 lbs.

Net Face Velocity F.P.M.Resistance in Inches of W.G. nominal thicknessC.F.M. Capacity by Size
1 Inch2 Inch10×2016×2016×2520×2020×2524×24

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