16"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 19.75"h] Round Damper Ring This Thermostat from Bramec will 12SFLX-R6 w4h4 Monitor the pump for

This Thermostat from Bramec will fit almost any thermostat

these grilles offer both functionality and aesthetic appeal

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 20" duct opening (measured at the opening)

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

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16"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 17.75"w x 19.75"h] Round Damper Ring This Thermostat from Bramec will 12SFLX R6 w4h4 Monitor the pump for This Thermostat from Bramec will fit almost any thermostat these grilles offer both functionality and aesthetic appeal