This new direct-fired gas make-up air unit for commercial and industrial facilities is available in three housing sizes that can provide from 800 to 15,000 cfm. The heating capacity of the Model DG is up to 1.6 million Btu per hour. Evaporative cooling up to 12,000 cfm. is also available.

Greenheck, P.O. Box 410, Schofield, WI 54476-0410; 715/359-6171.