20"W X 30"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 31.875"H] mobile home rv + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 34"w X 8"h is the size for the duct opening measurement only

high-impact clear plastic for long-lasting performance

and we’ve helped numerous contractors

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 22" OR 22" x 26" duct opening (measured at the opening)

Drainage Test: Run the pump for an extended period

20"W X 30"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 21.875"W X 31.875"H] mobile home rv + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 34"w X 8"h is the size for the duct opening measurement only high impact clear plastic for long lasting performance