CUSTOM Return air plenum for filter 12x12x1″ and round collar 8″ diameter

This is a Custom Sheet Metal return air filter rack plenum for filter 12″x12″x1″. Made in America by hand from American made 26 Gauge Steel Galvanized Sheet Metal . There is a 3/4″ hem flange on one 12″x12″ end Outside the plenum (around the flange) has dimensions 13-3/4 x 13-3/4″ and height 5-1/8″, and the other side is fitted with an end cap with a 6″ diameter collars . Actual overall dimensions flange side for this rack 13-3/4″ x 13-3/4″ . From top to bottom the plenum is 5-1/8″ long and the collar measures 4″ in length. There is a sliding door on the 12″ side for filter access. The door can slide from ether side allowing for easy access. Filter for this plenum is 12 x 12 x 1″. Filter is not included.CUSTOM NO RETURN