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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.