Steel Return Filter Grille Stamped-Face 16 X 25 (duct opening size) Description
Kozziair Filter Return Grille listed size 16â wide and 25â tall is for the duct opening measurement. The grille has hinged face door for filter of same size with thickness of 1â. Overall outside dimension is 18.6â wide and 27.6â tall. Difference Between grilles, registers, diffusers and ventsï¼ Grille â a series of deflectors in the shape of blades or fins fixed in a frame to allow air to pass through from duct to room space Register â a grille attached with a damper or valve to control the air flow volume Diffuser â a unit with duct connecting piece and a larger face piece with multiple blades to spread out air flow to multiple directions. Examples are drop ceiling T-bar diffusers and round ceiling diffusers. Size Selection GuideMeasure the size of the air duct opening(the size of the âholeâ ). Select the listed size that match the duct opening size. The outside or overall size is 2.6â larger for both width and length so it can cover the âholeâ. Do not use outside measurement for size selection or it would be too bit to fit.Width vs HeightThe first measurement in a return grille size is the width(horizontal measurement), the second measurement) is the height(vertical measurement). For example: if the hole on the wall is 16′ wide by 25′ tall, buy a 16×25 grille; If the hole is 25′ wide by 16′ tall, buy a 25×16 grille.