Exterior mount variable or fixed speed Auto-Draft" inducers are suitable for side wall or rooftop venting. The product reduces vent diameters up to 50% and dramatically shortening stack height above the roofline. It also provides energy savings and the ability to interlock up to 14 appliances.

Tjernlund Products Inc., 1601 Ninth St., White Bear Lake, MN 55110-6794; (800) 255-4208; fax (651) 426-9547.