24" X 24" Steel Access Panel Removable Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 25" Width X 25" Height] w30h30 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 8" x 26" or 26" x 8" is the size for the duct opening measurement only

+ Product Details Size - 10"w X 26"h is the size for the duct opening measurement only

Higher value MERV rating equates to finer filtration

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 25"w X 34"h is the size for the duct opening measurement only

24" X 24" Steel Access Panel Removable Door For Concealed Wall Ceiling Application With Slotted Lock [Outer Dimensions: 25" Width X 25" Height] w30h30 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 8" x 26" or 26" x 8" is the size for the duct opening measurement only + Product Details Size 10"w X 26"h is the size for the duct opening measurement only