8" X 20" Or 20" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 21.75] mobile home rv The ring base allows installation

The ring base allows installation without removing the thermostat

making it an indispensable component for heating

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

actual front end outer dimensions are approximately 34 5/8" width X 34 5/8" height

MERV 8 is the most reccomeded level of filteration by industry professionels

8" X 20" Or 20" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 21.75] mobile home rv The ring base allows installation+ Product Details Size 8"w X 20"h or 20" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 21. 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