8" X 18" Or 18" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 19.75] 4in diameter Filter Size - 21

Filter Size - 21

For 6" Round Duct Opening - Spiral or Flex

Airflow and filtration aren’t our only priorities in making this HVAC accessory

Polished Pre-Finish Gloss Varnish Ready To Install - Can Also Be Sanded And Re-finished According To Application Needs

8" X 18" Or 18" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 19.75] 4in diameter Filter Size - 21+ Product Details Size 8"w X 18"h or 18" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 19. 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