ZM-801 Round 8" Hole Size Brass Grille With Damper; 9" Exterior Diameter
Made to fit into a 8" round hole or duct, these grates have an exterior diameter of approximately 1" greater than their boot size. The damper is made from finely cast iron, with a Lost Wax Cast brass operator. None better anywhere, at any price.
This 8" grate is available in either brass (power polished) or iron (power abrasived, and then painted black ZM-IR-801).
The brass is unlacquered, but by special order these may be specially finished to match older hardware. Please call 360-379-9030 for pricing, and to special order the finish.
You may feel some resistance when opening and closing the cast iron louvers for the damper. The friction helps to keep the louvers in a set position to your liking, and withstand normal increases in air pressure caused by higher fan speeds from heating and cooling units.