12"x 12" Heavy Duty Return Air Filter Grille. ( White)
Quantity in Basket: None
12” x 12” STAMP FACE RETURN AIR FILTER GRILLE:
Our Heavy Duty Steel Return Air Filter Grille holds a standard 1" Furnace Filter and Features a Hinged Down Face for Easy Filter Replacement.
Return Air Filter Grille Description
1/3" spaced fins set at 20 degrees
Effectively conceals filter
Use standard 1" thick disposable filters (not included)
Face opens for easy installation and cleaning
Bright White Finish
Design for Wall or Ceiling application.
When Ordering your New Replacement Return Air Grille.
DO NOT MEASURE YOUR EXISTING GRILLE.
The Proper way to Order the Correct Replacement Return Grille is by measuring the Hole Size. Measure the Holes Width and Height.
If the Return Air Hole measures 25" wide by 20" tall, you will need to order a Return Air Grille 25x20. The Overall Return Air Grills Size is 1-3/4" with and height 1-3/4" Height bringing the Return Air Grilles 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.
Average face velocity = 390 fpm, based on filter capacity rating of 2 CFM per square inch of gross filter area. Free area averages 75% of grille core. For quick calculation free area (sq. in.) = listed width x height x .75.
· 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 the equation: CFM= Face Velocity X Effective Area. This is the basis for most engineering data.