New Series QVA/QV variable-air-volume, direct-fired, makeup air units are available in 15 model sizes and eight configurations with Btuh capacities ranging from 400,000 to 7 million and airflow ratings up to 60,000 cfm. Using one unit or a combination, the series is said to provide an efficient means of supplying tempered makeup air to a space or building by the use of a variable frequency drive (vfd) controller. During off-peak and reduced-load operation, the vfd varies the airflow from 100% down to 30% of capacity, providing energy savings, says the company.

Modine Airsystems, Modine Manufacturing Co., 1500 DeKoven Ave., Racine, WI 53403-2552; 888-901-4328, access code 88-13; (website).

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