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All installations and services must be performed by qualified service personnel.
This procedure can be repeated to determine the airflow for each room in the
residence. The results of these calculations are given in Table 6, below.
Table 6: Required Room Air Flowrates Based on Floor
Area for Example 2
Room
Room
Floor Area
(Sq. Ft.)
Room Air
Flowrate
(CFM)
Number of
Registers
Flowrate per
Register
(CFM)
Living 400 350 3
1 @ 120
2 @ 115
Dining 120 105 1 105
Kitchen 144 126 1 126
Master
Bedroom
360 315 2 2 @ 157
Bedroom 224 196 1 196
Bedroom 224 196 1 196
Master
Bathroom
64 56 1 56
Bathroom 64 56 1 56
Total 1600 1400 11
We will assume the airflow is approximately equally split between all registers in
a particular room. This completes steps (a) through (d) of the duct sizing method.
For step (e), static pressure drops for each system, branch, and component must
be selected. Since the appliance circulating blower can only tolerate a maximum
pressure of 0.4 in. W.G., the combined resistance of the supply and return air
systems cannot exceed this amount.
64