8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 17.75"h] w14h14 const dt = event 4 X 12 Is CRFG2028 Width_14in

const dt = event

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

ensuring it fits most standard thermostat models

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 22" duct opening (measured at the opening)

8"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 9.75"w x 17.75"h] w14h14 const dt = event 4 X 12 Is CRFG2028 Width_14in const dt = event + Product Details Size 10"w X 20"h X 2"d (for duct opening measurement only)