6"W X 4"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 7.875"W X 5.875"H] 18" Round Duct Pipe Its locking eight-tumbler mechanism and

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

this grille boasts a sleek frame that ensures a refined and seamless look

Discover the perfect balance of style and functionality with our Ceiling Grille Diffuser

with actual outer dimensions of 36

6"W X 4"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 7.875"W X 5.875"H] 18" Round Duct Pipe Its locking eight-tumbler mechanism and+ Product Details Size 6"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 875" width X 5. 875" height. High Quality High quality aluminum with counter sunk screw holes (screws included) and no sharp edges. Design Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just