8" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 5.75"H] w24h24 This Thermostat from Bramec will

This Thermostat from Bramec will fit almost any thermostat

durable plastic

these heavy-duty louvers are ideal for use in attics

And The Cooler Air From Outside WIll Flow In From The Bottom

Round-neck-to-square-face construction results in 360 degree air diffusion pattern similar to a full round diffuser

8" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 9.75"W X 5.75"H] w24h24 This Thermostat from Bramec will+ Product Details Size 8"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are 9. 75" width X 5. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a