Commercial Products  >  Dampers and Accessories
Modulating Over-Draft Damper

Modulating Damper used to adjust and maintain draft in an individual or common chimney and to shut it closed when the appliance(s) is shut off. Primarily used when draft is excessive and as part of a MODS system.


  • Multi-blade dampers in stainless steel 316L
  • Can be used up to 1400°F (760°C) / 1800°F (980°) intermittent 
  • For use with all types of boilers - condensing and non-condensing


Available Sizes (ID) 6" to 48" (150mm to 1200mm)
Material Stainless Steel 316L
Actuator Brushless DC Motor
Power 24VAC/VDC Brushless Motor
Torque 54 in-lbs (6 Nm)
Speed 90° in 15 Sec.
End Switches 2
Temperature Rating 1400°F (760°C) / 1800°F (980°C)  intermittent 
Warranty 2-year Factory Warranty
Listing/Certification UL 378 Standard for Draft Equipment
ULC/ORD-C378 (1975)

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MDF Modulating Over-Draft Damper—used to maintain draft in an individual or common chimney with excessive draft
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