The MultiZone Retro-Mate¿ is a fast, cost-effective way to replace multi-zone rooftop units. A self-contained unit with zone and bypass dampers, it is designed to mount on top of existing multi-zone ductwork and zones. Installation time is reduced from days to hours, according to the manufacturer. Using existing ductwork and fittings provides significant cost savings.

Thybar Corp., 913 South Kay Avenue, Addison, IL 60101; 800/666-CURB; fax 630/543-5309.