34"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 15.75"h] Copper Coil-Insulated Line Set All of these grills have

All of these grills have dampers

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

8" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

and installation is quick and simple with the included screws

+ Product Details Size - 22"w X 20"h X 2"d (for duct opening measurement only)

34"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 15.75"h] Copper Coil-Insulated Line Set All of these grills have+ Product Details Size 34"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 35. 75" Width X 15. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never