Overlapping rings stepped down for efficient, draft-free diffusion. Outer ring design resists ceiling smudging. Center cone slotted for optional chain operation. All-steel construction. Use with round damper 1800.
AmeriFlow registers, grilles and diffusers are designed to fit standard duct openings. For floor applications, measure both the width and length of the existing duct opening. An opening of 4"x10" requires a 4x10 register. When ordering sidewall/baseboard products, specify the horizontal dimension first.