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 Round-neck-to-square-face construction results in 360

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

Actual Filter Size – 29 3/4"w x 29 3/4" x 1"

these heavy-duty louvers are ideal for use in attics

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height

This Thermostat from Bramec will fit almost any thermostat

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 Round-neck-to-square-face construction results in 360+ 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