Return air plenum, for filter grill 20″ x 20″x5″ with 10″ collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x25″ filter grille. The size of the box is 20″x25″x5″ deep with a 3/4″ flange, and the 10 inch collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 26 5/8″. It’s manufactured from 26 gauge galvanized metal. The 10 inch collar will be cut centered in the plenum box for you to install it. If you need a different size or a different size collar, please check our eBay store. You can call or message us if you need a custom size that you don’t see listed. We will make and ship it out to you quickly.
(2×) Return air plenum, 20″ x 20″x5″ with (2×) 10″ collars & 3/4″ flange
These two return plenum box are designed to be used with a 20″x20″ filter grille. The size of the box is 20″x20″x5″ deep with a 3/4″ flange, and the 10 inch collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 3/4 “x 21 3/4”. They are manufactured from 26 gauge galvanized metal. The 10 inch collar will be cut centered in the plenum box for you to install it. If you need a different size or a different size collar, please check our eBay store. You can call or message us if you need a custom size that you don’t see listed. We will make and ship it out to you quickly.