The M-Series direct gas-fired makeup air heater heats and provides fresh makeup air to replace exhaust from new and existing commercial and industrial facilities, including warehouses, foundries, food processing plants, and automotive or aircraft service facilities. The ratings of the series range from 150,000 through 6.5 million Btuh heating capacities and 1,800 through 50,000 cfm. Control options include variable-frequency drive for variable air volume control, programmable logic controllers, pressure controls, manual controls, fan interlocks, time clocks, and thermostats.

Cambridge Engineering Inc., 17825 Chesterfield Airport Rd., Chesterfield, MO 63006; 800-899-1989; 636-530-6133 (fax); (website).

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