Pre-Installation Guidelines cont......
3) Do not install screws in damper frame that will interfere with unexposed blade
linkage and prevent damper blades from opening and/or closing.
4) Damper must be installed into duct or opening square and free of twist or
other misalignment. Damper must not be squeezed or stretched into duct or
opening. Out of square, racked, twisted or misaligned installations can cause
excessive leakage and/or torque requirements to exceed damper/actuator
design.
5) Damper and actuator must be kept clean, dry and protected from dirt, dust
and other foreign materials prior to and after installation. Examples of such
foreign materials include but are not limited to:
a) Mortar dust
b) Drywall dust
c) Firesafing materials
d) Wall texture
e) Paint overspray
6) Damper should be sufficiently covered as to prevent overspray if wall texturing or spray painting will be
performed within 5 feet (1.5m) of the damper. Excessive dirt or foreign material deposits on damper can
cause excessive leakage and/or torque requirements and inaccurate airflow measurement to exceed
damper/actuator design.
7) ACCESS: Suitable access (actuators maintenance, etc.) must be provided for damper inspection and
servicing. Where it is not possible to achieve sufficient size access, it will be necessary to install a
removable section of duct.
Spreader Bar
Attachments
Multi section dampers
Installation- Failure to follow instructions will void all warranties
1. Ensure the AMS or AMD series damper is mounted with airflow straightener upstream of the damper.
2. Duct opening or opening square should measure 1/4 inch (6mm) larger than damper dimension and should
be straight and level.
3. Use shims between damper frame and duct opening or opening space to prevent distortion of frame by
fasteners holding it in place. Brace at every horizontal mullion and vertically brace at every 8 feet (2.4m) of
damper width for strength. Dampers in high velocity (2000 fpm [610m per second]) may require more
bracing. Note: Greenheck dampers are specifically designed and engineered for structural integrity based on
model and conditions. Attachment, framing, mating flanges, and anchoring of damper assemblies into
openings, ductwork, or walls is the responsibility of the installer. Design calculations for these retaining and
supporting members should be determined by field engineers for that particular installation.
4. Individual damper sections, as well as entire multiple section assemblies must be
completely square and free from racking, twisting, or bending. Measure diagonally
from upper corners to opposite lower corners of each section.
5. Damper blades, axles, and linkage must operate without binding. Before system
operation, cycle dampers after installation to assure proper operation. On multiple
section assemblies all sections should open and close simultaneously.
2
Do not twist
or bow. Mount
damper plumb
in the opening.
AB
AF = BE
AB = CD
CD
EF
