pottorff BD Series Installation Instructions

General
The following guidelines provide basic assembly and installation
instructions for models BD-150, BD-250, CBD-150 and CBD-250
backdraft dampers.
Carefully lift the dampers by their frames using multiple lifting points if
necessary. Do not apply excessive force to a single point and
NEVER LIFT UNITS BY DAMPER BLADES OR BLADE LINKAGE.
Preparation
ampers
1. Locate all crates, boxes, cartons, etc.
2. Remove dampers from packaging, inspect for damage and
confirm quantities and sizes with packing list.
3.
Notify your Pottorff representative immediately of any
shortages or shipping damage.
Openings
1.
Inspect openings to ensure they are square and free from any
debris.
2. Verify that the damper will properly fit into the opening or into
the duct so that it can be installed square and will not be
racked.
Installation for Dampers with Standard Frame (Fig. 1)
1. Verify that the backdraft damper is square, plumb and not
racked.
2. Backdraft damper is approximately 1/4"
specified duct/opening.
Insert entire backdraft damper into duct/opening. Bottom of
3.
damper frame must sit flat on bottom of duct/opening to
prevent twisting, sagging or uplifting.
4. Install units using mounting clips or angles [3/8"
x 1" wide
(max.) (25) (min.)
clips against the perimeter of the front and back of the damper
frame, securing the clips to duct work.
5. Minimum of two fasteners per side to be used (top, bottom, left
and right jamb). Fasteners should be spaced 12"
center. (For alternate fastening method securing the frame
directly to the duct/opening, see Multiple Section Installation
details).
Dampers with Front or Rear Flange (Fig.2)
1. Verify that the backdraft damper is square, plumb and not
racked.
2. Inserted frame of backdraft damper is approximately 1/4"
smaller than specified duct/opening size.
3. Make sure that the backdraft damper's is flat and level when
being attached.
4. Secure backdraft damper's flange using appropriate
fasteners.
Information is subject to change without notice or obligation.
5101 Blue Mound Road, Fort Worth, Texas 76106
POTTOR ®
smaller than
(6.4)
high
(9.5)
x 20 ga. thick ]. Arrange
(1.0) (min.)
(305)
(6.4)
5. Pre-drill fastener holes in the backdraft damper flange before
placing over opening to reduce twisting and binding.
6. It is recommended that a minimum of two fasteners per side
be used (top, bottom, left and right jamb). Fasteners should be
spaced 12"
7. Do not over tighten fasteners. Over tightening may damage or
twist the backdraft damper.
Fig.1 Standard
Frame (no flange)
Installation for Multi-Sectioned Dampers (Fig. 3)
Dampers larger than the maximum single section size are
manufactured and shipped for field assembly.
Assemble sections together using #10 TEK screws 2"
shown.
1. Place first horizontal screw in between the top blade and the
second blade. See Detail 1. (Subsequent horizontal screws
should be spaced in between every other blade). See Detail 2.
2.
Vertical screws should be placed a maximum distance of 8"
from edge of frame and from center to center of each
(203)
screw. See Detail 3.
on
Detail 2
Detail 3
model BD and CBD

installation instructions

on center.
(305)
Fig. 2 Front and
Rear Flange
Detail 1
Fig. 3 Multi-Section Dampers
NOTE: Dimensions in parentheses ( ) are millimeters.
www.pottorff.com
min. long as
(51)