Model IGX-HV is an indirect gas-fired make-up air unit that provides heating and ventilating at airflows up to 15,000 cfm, the company says. Eight mixing box control options and five thermostat options offer ventilation and return-air functions, including four economizer cooling control options using outside air. The company’s furnaces are 80-percent thermal efficient and feature a post-purge cycle, which runs the combustion fan after the unit is shut down to vent corrosive hot air and moisture out of the heat exchanger.
Greenheck, P.O. Box 410, Schofield, WI 54476-0410; 715-359-6171; 715-355-2399 (fax); www.greenheck.com.