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Table 9 — Maximum Cfm Through the Inlet Collar
of a Single Unit or of Units in Air Series
MODEL
PLENUM
SIZE
(in.)
INLET
COLLAR
DIAM
(in.)
MAXIMUM TOTAL
AIRFLOW
(Cfm)
37HS1
5x7 4 110
7x7 6 400
9x9 8 800
11x11 10 1100
37HS2
7x7 6 400
9x9 8 800
11x11 10 1100
37HS4
9x9 8 800
11x11 10 1100
13 x 13 12 1600
In general, units in an air series should not be of mixed
sizes (cfm capacities). If units of different capacities are used,
a controller must be applied for each size unit. For example,
an application for 800 cfm using different capacity units, as
shown in Fig. 21, is acceptable only with multiple controls.
This arrangement, although not preferred, can be used if care
is taken to use the necessary controllers. In this case, 3 con-
trollers are required. However, the best installation for an
800 cfm (nominal cfm total) would be one in which all the
units are the same size. (Fig. 22.) In this case, a single con-
troller can be used in the space.
Fig. 21 — Air Series of Units with Different Capacities
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