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Brass Round Grates Vent Register With Damper, 8" Boot, 9" Outside (ZM-801)
Price: $165.90
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Brass Round Grates Vent Register With Damper, 8

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).

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.