This return air grille from Value Brand is your next step to ensuring the air quality from your HVAC system remains high and steady. This return air grille is designed with 23 ga. steel and a white finish. Features of this return air grille include: electrocoated and powder coated surface. Overall height is 9.75" and width is 31.75". The duct dimensions max out at 8" in height and 30" width.