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Installation Guidelines for heavy-duty backdraft dampers

Multi-Section Assemblies

Two Sections Wide Multi-section heavy-duty backdraft dampers

Two Sections Wide


  • Frame members are designed to overlap and are manufactured with two aligned positioning holes. When heavy-duty backdraft damper sections are correctly positioned, holes will be aligned.
  • Bolt alignment fasteners are shipped attached to the offset overlapping frame. (Alignment holes are not meant to be structural. Bracing may be deemed necessary by installer.)
  • Ensure that both sections are straight, even, and aligned with each other.
Four Sections Wide Multi-section heavy-duty backdraft dampers

Three Sections Wide


  • Applies to Series 7600, 7600 CW, and 7600 CWA only. Series 7600 WT cannot exceed two sections wide, because the operation of the external weight on the middle section would be impeded
  • Frame members are designed to overlap and are manufactured with two aligned positioning holes. When heavy-duty backdraft damper sections are correctly positioned, holes will be aligned.
  • Bolt alignment fasteners are shipped attached to the offset overlapping frame. (Alignment holes are not meant to be structural. Bracing may be deemed necessary by installer.)
  • Ensure that all three sections are straight, even, and aligned with each other.
Multiple sections wide by multiple sections high

Multiple Sections Wide by
Multiple Sections High


  • Applies to Series 7600, 7600 CW, and 7600 CWA only. Series 7600 WT cannot exceed two sections wide, because the operation of the external weight on the middle sections would be impeded.
  • Install bottom tier heavy-duty backdraft damper section(s) first.
  • Place second level of heavy-duty backdraft damper section(s) on top of bottom section(s), being careful that all sections are properly aligned.
  • Install top damper section(s).
  • Slide joiner(s) over frame member(s), where top and bottom section(s) meet(s).
  • Using self-drilling screws, fasten joiner to heavy-duty backdraft damper frame member(s) through pre-punched holes in joiner. Caution: Joiner is not designed to be structural. Additional bracing may be required if deemed necessary by installer.
  • Repeat procedure for all additional section tiers.
  • Ensure all sections are straight, even, and aligned with each other.
Optional Mullion End Caps

Optional Mullion End Caps
for flanged to duct type multi-section dampers


  • Mullion end caps are provided with all Flanged to Duct install type, multi-section, heavy-duty backdraft dampers.
  • These are required to prevent air flow from passing through open channels. (Mullion end caps are not intended for use as structural support.)
  • Caulk surfaces between mullion end caps and damper frame for an airtight seal.
  • Mullion end caps are not required for Installed in Duct, Extended Rear Flange, and Extended Front Flange install type heavy-duty backdraft dampers. As such they are not provided as standard, but may be ordered as separate parts.

Documents:


TAMCO Heavy-Duty Backdraft Damper Insatallation Guidelines