1/2" fin spacings Accepts 1″ air filter (not included) Durable white powder coat finish Removable Face.

25" wide x 20" tall. Takes a 25x20x1 filter. Hole should be 1/4" less that 25"x20". 

When ordering make sure to order the measurement of the duct opening, not the register from end to end on sizing.  End to End will be a larger measurement then the measurement stated.  The measurement stated is the size for the duct opening or vented area.