|MarketManager » Modeling HVAC Systems|
Unfortunately engineers from different regions call the same things different names, and to make matters worse, may use the same name for different things. To MarketManager:
- a supply fan is the primary mover of conditioned air into the space,
- while a makeup air fan is an additional fan which adds additional outdoor air to a ventilation deficient space.
In general, in MarketManager terminology, makeup fans are placed in addition to, not instead of supply air fans. Modeling as a "makeup fan" what really is a supply fan would lead to erroneous results (except for hydronic systems).
The only instances when I could see it making sense to have makeup air w/o supply fan are hydronic (heating-only) system, where you need additional O/A for ventilation and need to condition same.
Otherwise feel free to contact our Tech Support staff at (805) 329-6565, or via email at firstname.lastname@example.org.