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RECTANGULAR ZONE DAMPERS
The rectangular zone dampers are available in either medium pressure or heavy duty. For systems under 7.5
tons, use medium pressure dampers. For systems 7.5 tons or over, use heavy duty dampers. Motor drive
time open and close is 90 seconds.
RECTANGULAR MEDIUM PRESSURE ZONE DAMPERS (STMRTD)
Zonex Systems rectangular medium pressure dampers are recommended for
systems under 7.5 tons with a maximum differential static pressure of 1”. These
are fully modulating, power open, power close dampers. They are constructed
from heavy duty aluminum and stainless steel. The damper is an opposed blade
type that slips into a 3¼-inch wide cutout in the existing duct and attaches with
screws via a duct mounting plate. The duct mounting plate is 5 inches wide. A
hat section supports a reversing 24vac, 60Hz, 2 VA motor. A magnetic clutch
allows for continuous power to the motor and longer motor life. Two set screws
connect the motor to the damper shaft, allowing quick motor replacement if
necessary. Motor drive time from full open to full close is 90 seconds.
W
HEAVY DUTY RECTANGULAR DIMENSIONAL DATA
Part Number
STCD
W x H
Sizes available from 8” x 8” up to 48” x 48”
RECTANGULAR HEAVY DUTY ZONE DAMPERS (STCD)
Zonex Systems rectangular heavy duty dampers are recommended for systems 7.5
tons or larger with a maximum differential static pressure of 1.75”. These are fully
modulating, power open / power close dampers made of 20 gauge “snaplock” steel
frame with S & Drive duct connections. Allow a 16” gap in the duct for the damper.
Formed steel blade stops incorporate a gasket for quiet operation and improved
structural rigidity. Rectangular dampers under 10” in height incorporate a single
blade design. Dampers 10” or over use opposed blade design. A full stall
motor, drawing 2 VA, drives the motor from full open to full close in 90 seconds.
D
H
MOTOR
D
2 ½”
48” MAXIMUM WIDTH
MEDIUM PRESSURE RECTANGULAR DIMENSIONAL DATA
Part Number
STMRTD
W x H
2¼”
Sizes available from 8” x 6” up to 24” x 20”
2½”
5”
H
