Return air plenum for filter grille 20″x 30″x 5″ with 12″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 12″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 12″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 10″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 10″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 10″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 20″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 20″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 20″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 16″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 16″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 16″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 20″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 20″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 20″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 12″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 12″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 12″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 14″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 14″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 14″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 14″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 14″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 14″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 18″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 18″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 18″ 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.
Return air plenum for filter grille 20″x 30″x 5″ with 16″collar & 3/4″ flange
This return plenum box is designed to be used with a 20″x30″ filter grille. The size of the box is 20″x30″x5″ deep with a 3/4″ flange, and the 16″ collar is 4″ long. Overall dimensions to the outside of the 3/4″ flange are 21 5/8″x 31 5/8″. It’s manufactured from 26 gauge galvanized metal. The 16″ 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.