The Swordfish Ultra Violet Air Treatment System mounts inside the return-air duct or above the cooling coil of household heating and air-conditioning systems. The Swordfish sterilizes bacteria, viruses, molds and dust mites. The device has been tested by Lighting Sciences Inc. to confirm kill rates. When operating in an average home, Swordfish killed 85 percent of common household bacteria in a single pass. Available in various strengths, the Swordfish now comes in a 60-watt unit.

Allanson International Inc., 33 Cranfield Road, Toronto, ON M4B 3H2; www.allanson.com.