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TAMCO Installation Guidelines for medium-duty backdraft dampers

Installing multi-section
medium-duty backdraft dampers

STRUCTURAL SUPPORT REQUIREMENTS:

  • Field-supplied, intermediate structural support is required to resist applied velocity and pressure loads for backdraft dampers that are two or more sections high or wide.
  • Angle bracing installed at multi-section joints will prevent bowing and twisting of backdraft damper units.
  • TAMCO Series 7000 Backdraft Dampers weigh approximately 2 lbs/ft² (9.76 kg/m²). TAMCO Series 7000 WT and 7000 CW Backdraft Dampers weigh approximately 3 lbs/ft² (14.65 kg/m²).

MULTI-SECTION BACKDRAFT DAMPER ASSEMBLIES:

  • Sections may be installed in or over its own field-supplied support structure individually, or they may be field-assembled prior to installation.
  • If field-assembly is required before installation, lay dampers on a flat surface (such as a floor) with TAMCO label facing upwards to assemble sections.
  • T-Bars provided by TAMCO to interconnect damper sections are for alignment purposes only and may not be considered as structural supports.
Two sections wide backdraft damper

TWO OR MORE SECTIONS WIDE

  • Ensure that all backdraft damper sections are straight, even, and aligned with each other.
  • T-bars are to be installed on the back (sticker) side of the damper.
  • To pierce alignment holes in the damper frames where the two section meet, apply the T-bar extrusion so that it sits 0.625" (16 mm) above the bottom edge of the vertical frames where backdraft damper sections meet. Verify that the T-bar sits flat against each damper frame and is flush to the side of each frame member, so it does not interfere with blade operation.
  • Secure the T-bar to Section 2 through the lowest right hole in the T-bar, using a #8x¾” Tek screw. Next secure the T-bar to the Section 1 through the uppermost left hole in the T-bar, using a #8x¾” Tek screw. This will ensure proper alignment of two horizontally joining sections, once the T-bar is fully installed.
  • If leakage is a concern, now remove the T-Bar and apply a bead of silicone caulk along the joint where the two damper frames meet. Then, replace the T-Bar and the two screws, using the alignment holes made previously.
  • Finish securing the T-Bar to the damper frames by inserting #8x¾” Tek screws into the rest of the holes located on the T-Bar.
  • Repeat the steps listed above for any additional sections that are connected horizontally.
Multi-section high by multi-section wide medium-duty backdraft damper

MULTIPLE SECTIONS WIDE
BY MULTIPLE SECTIONS HIGH

  • Ensure that all backdraft damper sections are straight, even, and aligned with each other.
  • Install the bottommost sections of the backdraft damper assembly first.
  • T-bars are to be installed on the back (sticker) side of the damper. Each T-bar will be shorter than the height of a single section. This is to ensure that a full T-bar piece can be centered across the intersection where four damper sections meet.
  • To pierce alignment holes in the damper frames where the two section meet, apply the T-bar extrusion so that it sits 0.625" (16 mm)
    above the bottommost edge of the vertical frames where backdraft damper sections meet. Verify that the T-bar sits flat against each damper frame and is flush to the side of each frame member, so it does not interfere with blade operation.
  • Secure the T-bar to Section 2 through the lowest right hole in the T-bar, using a #8x¾” Tek screw. Next secure the T-bar to the Section 1 through the uppermost left hole in the T-bar, using a #8x¾” Tek screw. This will ensure proper alignment of two horizontally joining sections, once the T-bar is fully installed.
  • If leakage is a concern, now remove the T-Bar and apply a bead of silicone caulk along the joint where the two damper frames meet. Then, replace the T-Bar and the two screws, using the alignment holes made previously.
  • Finish securing the T-Bar to the damper frames by inserting #8x¾” Tek screws into the rest of the holes located on the T-Bar.
  • Repeat the steps listed above for any additional sections that are connected horizontally.
  • Install the next row of dampers. Stack the next T-Bar directly above the previously fastened one, and repeat the steps above for all subsequent backdraft damper sections, until the full height of the damper is connected with T-Bars.

Documents:


TAMCO Medium-Duty Backdraft Damper Installation Guidelines