model CD-85, CD-86
industrial control damper
triple-V blade
Application Ratings
CD-85 and CD-86 control dampers employ a rugged channel
frame and triple-V blades for automatic air control and manual Damper Maximum System Maximum System
balancing in medium to high pressure and velocity applications. Width Pressure with seals Pressure without seals
Standard Construction
32" (813) 15.0 in. wg (3.8 kPa) 20.0 in. wg (5.0 kPa)
42" (1067) 15.0 in. wg (3.8 kPa) 15.0 in. wg (3.8 kPa)
Frame: 8" ¥ 2" ¥ 12 ga. (203 ¥ 51 ¥ 2.8) galvanized steel channel. 60" (1219) 7.0 in. wg (1.8 kPa) 7.0 in. wg (1.8 kPa)
Blades: 73/4" ¥ 12 gauge (197 ¥ 2.8) galvanized steel — triple-
V. Parallel (model CD-85) or opposed (model CD-86) action.
Max. Damper Maximum Damper Maximum System
Axles: 1" (25) diameter plated steel. Width Height Velocity
Linkage: Concealed in frame. 60" (1524) 68" (1727) 6000 fpm (30.5 m/s)
44" (1118) 96" (2438) 6000 fpm (30.5 m/s)
Bearings: Stainless steel sleeve-type, pivot in bushing, press fit 60" (1524) 80" (2032) 5000 fpm (25.4 m/s)
into frame.
50" (1270) 96" (2438) 5000 fpm (25.4 m/s)
Control Shaft: 1" ¥ 6" (25 ¥ 152) round drive axle with shaft 60" (1524) 86" (2184) 4000 fpm (20.3 m/s)
support bracket and bearing mounted to damper frame with 50" (1270) 96" (2438) 4000 fpm (20.3 m/s)
factory mounted/welded manual locking quadrant.
Minimum Size: CD-85 (one blade): 6" ¥ 8" (152 ¥ 178) Leakage: 18.5 cfm/ft2 @ 20.0 in. wg. (0.09 m3/s/ m2 @ 5.0 kPa) with low
CD-85 or CD-86 (two blades): 6" ¥ 12" (152 ¥ 305) leakage seals.
16.0 cfm/ft2 @ 15.0 in. wg. (0.08 m3/s/ m2 @ 3.8 kPa) with low
Maximum Size: 48" ¥ 72" (1219 ¥ 1829) with seals leakage seals.
60" ¥ 96" (1524 ¥ 2438) without seals 11.0 cfm/ft2 @ 7.0 in. wg. (0.06 m3/s/ m2 @ 1.8 kPa) with low
leakage seals.
Options
Temperature: –65°F to 250°F (–54°C to +121°C) with no seals.
o Factory installed external mount actuator:
o 24 VAC o 120 VAC o 230 VAC –40°F to 250°F (–40°C to +121°C) with EPDM seals.
o Pneumatic o Modulating
o Stainless steel jamb seals.
o Low leakage blade edge seals (includes flexible metal jamb
seals): o PVC o Silicone
o Stainless steel construction:
o 304 o 316
H*
o Vertical mounted blades with thrust washers.
o Bolt holes in damper frame:
o One side o Both sides
†
2" (51)
Std.
Control Dampers CD85/CD86 (1/2) April 2014
8" (203) 8" (203) W*
Std. Std.
2" (51) Std. 2" (51) Std.
Model CD-86
*Damper dimensions furnished
approximately net I.D..
CD-85 CD-86
†
211/16" when equipped with frame mounted bearings.
Information is subject to change without notice or obligation. NOTE: Dimensions in parentheses ( ) are millimeters.
POTTORFF ® 5101 Blue Mound Road, Fort Worth, Texas 76106 www.pottorff.com
CD-85 and CD-86 Bolt Hole Dimensions
E M
J Dimension Description
M __________ inches Hole Diameter
E __________ inches Centerline of Bolt Hole From Inside Edge of Frame
K
F __________ inches First/Last Hole in Head/Sill
G ___ @ ___(x) inches Number of Holes/Spacing in Head/Sill
J __________ inches First/Last Hole in Jamb
K ___ @ ___(z) inches Number of Holes/Spacing in Jamb
G
F
Airflow Performance Data
Pressure Loss vs. Velocity Pressure Limitations
Figure 5.3 — Ducted Inlet and Outlet Without Seals With Seals
Pressure drop testing was
performed in accordance with
AMCA Standard 500-D using
Figure 5.3 — Ducted Inlet and
Outlet. All data has been
corrected to represent air
density of 0.075 lb/ft. Actual
pressure drop in any ducted
HVAC system is a combination
of many elements. This
42 x 42
information, along with analysis
of other system influences,
should be used to estimate
actual pressure losses for a
damper installed in a given
HVAC system.
Control Dampers CD85/CD86 (1/2) April 2014
5D 6D Velocity Limitations
4000 fpm
(20.3 m/s)
Ducted Inlet and Outlet 6000 fpm 5000 fpm
AMCA Figure 5.3 Illustrates a fully ducted (30.5 m/s) (25.4 m/s)
damper. This configuration represents the
lowest pressure drop of the three test
configurations because entrance and exit
losses are minimized by straight duct runs
upstream and downstream of the damper.
Information is subject to change without notice or obligation. NOTE: Dimensions in parentheses ( ) are millimeters.
POTTORFF ® 5101 Blue Mound Road, Fort Worth, Texas 76106 www.pottorff.com
