The top-of-the-line Return Air Grille is bar-type. And the best bar-type Return Air Grille is made of aluminum. Lightweight, rust resistant, and durable; Truaire's A270 Return Air Grille is the best of the best for residential return air applications. Each aluminum fixed blade is set at 60 degrees and 3/4 in apart. Finished in our pristine white powder-coat, this is a tough act to follow. TRUaire™ Return Air Grille, 2-Way, Series: A270, 10 x 10 in Size, 9-1/4 in Duct Height, 11-3/4 in Overall Width, 1 in Overall Depth, Fixed Horizontal Blade Grate, 60 deg Deflection Angle, 3/4 in Blade Spacing, Aluminum, White Powder Coated, Import