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Table 10 — Minimum Static Pressure at Control
(Master) Unit — Units with System-Powered
Controls and Standard Diffusers
AIRFLOW
(Cfm)
37HS1 37HS2 37HS4
PLENUM SIZE (in.)
7x7 7x7 9x9
5x7 9x9 9x9 11x11
11x11 11x11 13x13
Minimum Static Pressure (in. wg)
40
0.75 0.75 N/A N/A
50
60
70
80
0.75 0.75 0.75 N/A90
100
110 0.90 0.90 0.75 N/A
120
N/A N/A 0.75 N/A
140
160
N/A N/A 0.75 0.75180
200
220 N/A N/A 0.90 0.75
240
N/A N/A N/A 0.75
280
320
360
400
440 N/A N/A N/A 0.90
N/A — Not Applicable
NOTE: Maximum inlet pressure — 3.0 in. wg.
Table 11 — Additional ⌬P for
Extended Lengths of Flexible Duct
FLEX
DUCT
DIAM
(in.)
TOTAL
CFM
IN AIR
SERIES
ADDITIONAL
⌬P PER
10 FT FLEX DUCT
(in. wg)
6 400 0.2
8 800 0.16
10 1100 0.1
12 1600 0.07
Table 12 — Additional ⌬P for
Flexible Duct with 90-Degree Bend
FLEX
DUCT
DIAM
(in.)
TOTAL
CFM
IN AIR
SERIES
RADIUS
OF
BEND
(in.)
ADDITIONAL ⌬P
FOR 90° BEND
IN FLEXIBLE DUCT
(in. wg)
6 400 18 0.26
8 800 24 0.16
10 1100 30 0.08
12 1600 36 0.04
C—Controller
Fig. 23 — Three 37HS2 Modulineா Units in Adjoining Modules
Fig. 24 — Four 37HS2 Moduline Units in Alternate Series Modules
36