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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.