Rezzinâ„¢ Model RZ16 is a round ceiling diffuser. The unit has a removable interlocking multiple-collar system, which connects to standard flexible duct sizes. It is made of high-strength polymer resin. The diffuser is equipped with an integral spring-loaded damper that locks in place after adjusting. Diffuser cores are removable, making service or cleaning quick and easy, says the manufacturer. The RZ16 has a ratcheting clamp system that requires no tools when installing the diffuser to drywall or ceiling tiles.

Hart & Cooley Inc., 500 East Eighth St., Holland, MI 49423; 616-392-7855;;

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