18"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 23.75"h] Aluminum Bar Adjustable airflow control - by RFG3024 Black HP const content item Hi-Lo Oval Stack Head

Adjustable airflow control - by rotating the middle disk

the gap will expand and retract to meet perfect air supply needed

+ Product Details Size - 32"w X 24"h X 2"d (for duct opening measurement only)

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+ Product Details Size - 10"w X 20"h X 2"d (for duct opening measurement only)

18"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 23.75"h] Aluminum Bar Adjustable airflow control by RFG3024 Black HP const content item Hi Lo Oval Stack Head Adjustable airflow control by rotating the middle disk the gap will expand and retract to meet perfect air supply needed