6" x 4" Stamp Face Return Air Grille. (White)
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6" x 4" STAMP FACE RETURN GRILLE: 1/2" louver spaced in dual angular formation for higher strength and maximum free area Finished with COLOR:Brite White Counter Sunk Screw Holes with 2"" Long Screws Provided in Each Grille.
When Ordering your New Replacement Return Air Grille, Diffuser.
DO NOT MEASURE YOUR EXISTING GRILL.The Proper way to Order the Correct Replacement Return Grill is by Measuring the Hole Size.Measure the Holes Width and Height.
If your Return Air Hole Size is 25" wide by 20" tall, you will need to order a Return Air Grill 25x20.
The Overall Return Air Grills Size is 1-3/4" Width by 1-3/4" Height bringing the entire Return Air Grills Size to 26-3/4" x 21-3/4".
The extra 1-3/4" is designed to hide the old paint markings on the wall or ceiling.
* Frequently Asked Questions *
What is "Free Area"? Free area is the total minimum area of the openings in the supply outlet or return inlet (usually in square inches) through which air can pass. Also known as the "see-through area". (See also "effective area"). What is "Effective Area" ? Effective area is the net area (in square feet) of a grille utilized by the area stream in passing through the face openings. It is used in the equation: CFM= Face Velocity X Effective Area. This is the basis for most engineering data.