MAU Installation Manual
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12
AIRFLOW DESIGN PARAMETERS
The King MAU has a wide range of airflow options that can be field adjusted to match the needs of
a specific installation. Providing fresh air into a building has several design parameters that must
be taken into consideration:
1. The amount of fresh air required is normally calculated as Cubic Feet per Minute (CFM) per
person or CFM per square feet of the building or a room. The required CFM can also be
designed to meet a specific exhaust air condition such as in a commercial kitchen where the
MAU is set to match the exhaust air of the cooking hoods.
2. Static pressure is one of the most important factors in HVAC design. Simply put, static
pressure refers to the resistance to airflow in a heating and cooling system's components
and duct work. To determine operating total external static pressure, measure pressures
where air enters and leaves the MAU equipment. Add the two readings together to find total
external static pressure. Make sure not to exceed the external static pressures listed in the
design tables, doing so will cause harm the equipment.
3. Temperature rise or Delta T is the difference between the incoming air temperature and the
discharge temperature of the MAU. In make-up air applications the required temperature
rise is influenced by the geographic territory where colder climates require much more heat
capacity to temper cold incoming air into the building. Another factor to consider is whether
the fresh air is delivered directly such as to a room, hallway or delivered to the supply side of
an HAVC system where the conditioned are might need to be 70F versus the fresh air being
delivered to the return air intake where the design temperature could be 55F. Under sizing
the MAU could lead to insufficient delivery temperatures causing colder than desired air to
enter the building.
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