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MoreARLINGTON, Va. - The first in a four-part series of technical bulletins on direct-fired make-up air (MUA) equipment is available at the Air Conditioning Contractors of America's (ACCA) Web site. Traditional use of direct-fired equipment; Using direct-fired units for heating; Using direct-fired units to purge contaminants; and Safety.
ACCA Technical Bulletin 109 covers specifications for and operation of direct-fired MUA equipment in situations where one or more HVAC systems exhaust air from the space and require an equivalent amount of outdoor air (or make-up air) to maintain comfort, air quality, and equipment performance. Many commercial and industrial spaces have substantial make-up air or air-change requirements. These include manufacturing plants, garages, aircraft hangars, kitchens, shopping malls, and some warehouses.
Among the subjects addressed in the bulletin are:
Upcoming technical bulletins will address other issues associated with make-up air units: air balance, heat flow, humidity and condensation; duct systems, efficiency, controls (including indoor air quality), accessories, outdoor air intake; and sizing.
The bulletin is available to ACCA members only and can be downloaded at www.acca.org/tech/bulletins/.
Publication date: 08/15/2005
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