18" X 28" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 30 5/8"] fixed bar Actual Filter Size – 21 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212
Yard notes & kiln story
Description
Actual Filter Size – 21 3/4"w x 7 3/4" x 1"
Actual Filter Size – 27 3/4"w x 5 3/4" x 1"
Actual Filter Size – 17 3/4"w x 7 3/4" x 1"
Efficient Airflow Design: The slots are meticulously angled to diversify airflow in two directions
And Meets/Beats ASTM B280 Standard
18" X 28" Steel Return Air Filter Grille for 1" Filter Removable Frame [Outer Dimensions: 20 5 8" X 30 5 8"] fixed bar Actual Filter Size – 21 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 21 3 4"w x 7 3 4" x 1" Actual Filter Size – 27 3 4"w x 5 3 4" x 1"