Flush core and frame provides smooth surface
Spiral pipe diameter must be 4” larger than the width of the grille
Louvers will be Parallel to the First Dimension
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 30" Duct Opening (front blades parallel to shortest dimension)
Standard Features * 1/2" x 1/2" x 1/2" aluminum lattice face *
Architectural Lattice Grilles 1307-30x22 Commercial Flush core and frame providesStandard Features * 1" rim size (2" larger than nominal duct size) * 14 gauge steel * 1305: 1 2" lattice opening, 3 16" cross bars, 53% free area * 1306: 3 4" lattice opening, 1 4" cross bars, 57% free area * 1307: 13 16" lattice opening, 3 16? cross bars, 69% free area * 1308: 7 8" lattice opening, 1 4" cross bars, 60% free area * Soft White Options * Countersunk screwholes with matching Phillips #8 x 1 1 2" oval Screws * 10 or 12 gauge steel *