Fits 16x8 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 17.75"W X 9.75"H (16" W x 8" H Duct Opening)The Listed size 16"x8" is for inside duct opening measurement, actual outside dimension is 17. 75"x9. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow applications. Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection

The Listed size 12"x8" is for inside duct opening measurement

75” wide by 7

"outside" measurement is the surface you can see after the installation

This premium PU tubing has ultra smooth surface and bright color

Plastic sidewall/ceiling register is made of ABS plastic in bright white

Our connector hoses are built with high quality which exceeds industry standards like UPS

Heavy duty stamped steel face for long lasting use

it refers to the side of the "tongue" so that it will fit in a 14"x 6" hole

One Way Air Flow deflection Design

The Listed size 20"x8" is for inside duct opening measurement

you will feel either too cold or too hot

6” larger for both width and length so it can cover the “hole”