4" X 8" Or 8" X 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 9.75] Condensate Pump Accessories + Product Details Size -

+ Product Details Size - 28"w X 34"h is the size for the duct opening measurement only

ISO Supply Diffusers perform efficiently with air loadings of 6 to 30 air changes per hour (based on 10 ft

our damper is designed to perfectly align with your setup

and long-lasting performance

+ Product Details Size - 10"w X 18"h is the size for the duct opening measurement only

4" X 8" Or 8" X 4" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 5.75 X 9.75] Condensate Pump Accessories + Product Details Size -+ Product Details Size 4"w X 8"h or 8" x 4" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 5. 75" width X 9. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully