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DUROZONE SPRING-RETURN DAMPERS

The new DuroZone round spring return dampers NSPRD024 and SPRD110 series, can be configured for either spring OPEN or spring CLOSED operation. For example: Spring-Return OPEN means that when the power is off, the damper OPENS.
DuroZone "Mid-Torque" spring-return round dampers come in sizes from 4 to 20 inches in diameter with a 24 volt motor.

NSPRD Series Features:
• Gasketing included for high integrity seal
• Single set screw secures motor
• DuroZone "Mid-Torque" Spring Return Motor

Note: The DuroZone round spring return dampers with the new Mid-Torque motors are designed for fresh air intake.  Although we recommend the RD, MB and MS series for zoning, the NSPRD024 with a Mid-Torque motor configured spring OPEN can be used for zoning.

- The DuroZone round spring return and multi-size spring return dampers with a standard motor are fresh air dampers.  They are not built for zoning.

Multi-Size Spring-Return Dampers
Notes: - These dampers are either spring return open or closed operation, not both.
            - The SPMS-SO with a Mid-Torque motor can be used for zoning systems, although we recommend the RD, MB and MS series
               for this purpose.
            - All Multi-Size dampers, (except 6x12), have 3 adjustments; 6x12 has two adjustments.

For a replacement motor on a Multi-Size spring-return damper, call our customer service at (514) 422-9760.