The GH Series gas-fired humidifier offers capacities up to 400 lb/hr using multiple heat exchangers. Each heat exchanger is fully removable and has smooth vertical surfaces for easy cleaning of the unit. Other features include a modulating blower and gas valve assembly, giving a turndown ratio of 16:1; a dual-full system; and a built-in internal drain water cooler to ensure water is tempered before going to drain to meet local codes.