The new Model IG-HV indirect gas-fired makeup-air units for commercial and institutional use features a power vented 80 percent-efficient indirect gas-fired furnace with post-purge cycle. The units are supplied with double-width, double-inlet Greenheck forward curved blowers tested for high efficiency and low-sound levels. The IG-HV provides airflow volumes to 7,000 cfm with heating capacities up to 400,000 Btuh input. The model offers three heating and ventilation options and eight economizer and mixing-box options.

Greenheck, P.O. Box 410, Schofield, WI 54476-0410; (715) 359-6171; fax (715) 355-2399; www.greenheck.com.