16" X 16" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 17" Width X 17" Height] w22h22 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 36"w X 26"h is the size for the duct opening measurement only

Design – The "W" shaped pleats give you more filter surface thereby capturing more dust

+ Product Details 16"w X 16"h is the size for the drywall opening measurement only

5/8” - 2579 PSI

L/H@0 FT: - 38

16" X 16" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall Ceiling Application With Slotted Lock [Outer Dimensions: 17" Width X 17" Height] w22h22 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 36"w X 26"h is the size for the duct opening measurement only Design – The "W" shaped pleats give you more filter surface thereby capturing more dust