18" X 30" Or 30" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 31.75] Floor Grille 30" x 8" Pleated MERV

30" x 8" Pleated MERV 8 Filter for HVAC Return Filter Grille - 3 Pack

actual front end outer dimensions are 13" Width X 13" Height

and Diffusers

Strong aluminum frame & cube core that never rusts

18" X 30" Or 30" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 31.75] Floor Grille 30" x 8" Pleated MERV+ Product Details Size 18"w X 30"h or 30" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 31. 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