Copy Right RetroZone inc.2012 

Factory Direct SD "Super Duty" Series Dampers

Starting at $95
Available from sizes 3 inches  to 18 inches

The SD line of round mechanical dampers provides you with a commercial grade round

damper at a price that competes with residential grade dampers.  The quality of materials is

 "second to none" and is backed up by a 5 year - Best in Industry Warranty.

Belimo LMB24-3-T 3 Wire Power Open/Power Close Brushless Motor

-True Commercial Quality

- 45 in - Ibs Torque
- Minimum Open and Close Adjustments
- 90 second activation
- Motor will not heat up

-Can operate same as a spring return damper in Slave Zone set-ups
- Rated up to 2 in. of Static Pressure
- Duro-Dyne Direct Coupled Linkage, Bronze
Bushings, and a 1/2 in. universal drive shaft

5 Year Warranty!
Best industry warranty available!  Motor covered by conditional Belimo manufactures warranty for up to five years;  exclusions apply.  $10 service charge applies to motors after year 2.  Copy of complete warranty available upon request.

- Heavy gauge galvanized steel with reinforcing
beads for super duty strength

- Compatible with any zoning system or application using a power open / power close damper + works with slave zones!

3,4,5,6 and 8 inch SD Damper

10 and 12 inch SD Dampers

14 and 16 inch SD Damper

18 inch SD Damper



DRD Residential Round Series Mechanical Dampers

Three wire, power open, power close damper draws power only when opening or closing. Use on all zone control applications.  Heavy gauge steel with easy to replace 24VAC motor, and bronze bushings.  The most popular damper sold in the USA.  Unlike most 3 wire dampers, the DRD dampers can be used as a slave zone damper (connected directly to a thermostat) without the use of a relay. Requires 3 wires for operation.

Available Sizes:4" to 10", then 12", 14", 16", and 18" diameter

Small DRD Damper

Medium DRD Dampers

Large DRD Damper

Extra Large DRD DAMPER



NSPRD Residential Round Series Mechanical Dampers

This damper is a Spring Return Damper with a 2 wire motor
that can be field configured for either Power Open (PO) OR
Power Closed (PC).  The damper blade will remain open or closed,

as long as power is supplied to the motor.  Comes standard with
low leakage Vinyl Nitrite gaskets and are available with
24VAC or 110VAC actuators.

Available Sizes: 4" - 10", and 12".
NSPRD Dampers have a 2
Wire Spring Return Motor


Medium NSPRD




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