Auto-Zone Control Systems Zoning Design Guide (Version 01B) - Manual (Page 19)

Auto-Zone Systems 19
Zoning Design Guide
can cause air flow problems. These slide-in dampers
require that the damper frame be inside the duct. Imag-
ine an 8 x 10 rectangular duct using a slide in damper
with a frame thickness of 1”. The frame alone would
reduce the opening to 6 x 8.
Another possible problem encountered with rectangu-
lar dampers is the blade width. Many damper manufac-
turers supply dampers with 6” or 8” dampers blades.
This can become a major problem, for example, if the
Rectangular Dampers
Auto-Zone rectangular dampers are high quality alu-
minum construction with opposed/air foil designed
blades for superior control and have both blade and jamb
seals for tight shut off. The dampers are installed using
a mounting flange. The purpose for the flange mount-
ing is to allow as much unrestricted free space within
the duct as possible.
Many companies utilize slide-in type dampers which
Bypass & Slave Dampers Zone Dampers
Table 1-1: Round Damper Selection Data
Damper Round Duct Size
(Area Ft 2 )
6”
(0.188)
8”
(0.338)
10”
(0.532)
12”
(0.769)
14”
(1.050)
16”
(1.375)
CFM @ 1” Velocity Pressure
Air Flow Probe “K” Factor- For Pressure
Independent Applications Only
474 950 1417 2120 2908 3700
Velocity Through Zone Damper
FPM
Airflow Through Zone Damper - CFM
( ∆P
S
inches W.C. With Air Damper Full Open)
750 - Zone
141
(0.03)
254
(0.02)
399
(0.01)
577
(0.02)
788
(0.01)
1031
(0.01)
1000 - Zone
188
(0.05)
338
(0.03)
532
(0.02)
769
(0.03)
1050
(0.02)
1375
(0.01)
1250 - Zone
235
(0.07)
423
(0.04)
665
(0.03)
961
(0.04)
1313
(0.03)
1718
(0.02)
1500 - Zone
282
(0.09)
507
(0.06)
798
(0.04)
1154
(0.05)
1575
0.04)
2062
(0.03)
1750 – Bypass Only
329
(0.12)
592
(0.08)
931
(0.06)
1346
(0.06)
1838
(0.05)
2405
(0.04)
2000 – Bypass Only
376
(0.15)
676
(0.10)
1064
(0.07)
1538
(0.07)
2100
(0.07)
2749
(0.05)
2250 – Bypass Only
423
(0.18)
761
(0.13)
1197
(0.09)
1730
(0.09)
2363
(0.08)
3094
(0.06)
WattMaster reserves the right to change specifications without notice
1/2" Foil Faced
Insulation
Actuator
Round Damper
Blade Assembly
Control Enclosure
(Cover Removed)
AIR FLOW AIRF LO W
Bypass & Slave Interface
1/2" Foil Faced
Insulation
Actuator
Zone Controller
Round Damper
Blade Assembly
Control Enclosure
(Cover Removed)
AIR FLO W AIR FLO W