12" X 4" FLOOR REGISTER WITH LOUVERED DESIGN - FIXED BLADES RETURN SUPPLY AIR GRILL - WITH DAMPER & LEVER - BROWN Aluminum And is classified as Class

And is classified as Class 1 Fire Proof - B1

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

Suitable for all AC applications

actual front end outer dimensions are approximately 37

12" X 4" FLOOR REGISTER WITH LOUVERED DESIGN - FIXED BLADES RETURN SUPPLY AIR GRILL - WITH DAMPER & LEVER - BROWN Aluminum And is classified as Class+ Product Details Size 12"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 5" X 5. 5" wider. Installation Location Floor. Design Rigid gauge built for durability and long life in mind, but still light and handy. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed. Quality Packaging Carefully shrink wrapped with cardboard backing to prevent damage