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This simple adjustment reduces HVAC strain
+ Product Details Size - 18"w X 10"h is the size for the duct opening measurement only
Our coils have a very high PSI burst pressure
Actual Filter Size – 29 3/4"w x 11 3/4" x 1"
+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only
20" X 20" ALUMINUM RETURN FILTER GRILLE FOR 1" FILTER - EASY AIR FLOW - LINEAR BAR GRILLES Fixed Blades This simple adjustment reduces HVAC+ Product Details Size 20"w X 20"h is the size for the duct opening measurement only, [Outer Dimensions: 22. 5"w X 22. 5"h] Actual Filter Size 19 3 4"w x 19 3 4" x 1" High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Location Sidewall and ceiling. Design Heavier gauge than needed,
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