22"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 17.75"h] Adjustable Return Design – Rigid gauge ABS Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Design – Rigid gauge ABS plastic

+ Product Details Size - 20"w X 14"h X 2"d (for duct opening measurement only)

These are specially sized to fit into all drop ceilings

+ Product Details Size – 12"w X 12"h is the size for the duct opening measurement only

Can be hooked up with our "Butterfly Dampers" for precise airflow control

22"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 23.75"w x 17.75"h] Adjustable Return Design – Rigid gauge ABS Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Design – Rigid gauge ABS plastic + Product Details Size 20"w X 14"h X 2"d (for duct opening measurement only)