DuraVent FasNSeal - Fixed Damper - Manual (Page 2)

2
INTRODUCTION
The purpose of the Fixed Blade Damper is
to ensure optimum pressures through an
appliance. The Damper will aid in the proper
operation and efficiency of the appliance
by preventing higher than desired draft
readings.
INSTALLATION
• IMPORTANT: The max rated temperature
for the fixed blade damper is 392°F
(200°C). When the damper is installed,
the entire FNS system is to be de-rated in
maximum temperature to this value.
• Always follow appliance manufacturer’s
installation instructions for proper appliance
setup and venting requirements.
• Refer to the FasNSeal SW & W2 Installation
Instructions for correct installation to
FasNSeal vent lengths and adapters.
• It is important to note that the Damper
can be installed vertically, diagonally and
horizontally.
• If the Damper is going to be installed
horizontally, make sure the Damper Axis is
horizontal (Fig.1). Make sure the venting is
pitched towards the boiler by a value of ¼”
drop for every foot of vent length (Fig.2 and
Fig.3) for proper condensate management.
The weight on the damper is a fail safe to
make certain that the damper will be open in
the event of failure. Ensure that the weight is
at the top of the damper plate when closed in
the Horizontal (Fig.1).
Horizontal Installation (Fig.1, Fig.2, Fig.3)
• To prevent the build up of condensation in
horizontal installations, it is required to use
an Eccentric Increaser rather than Tapered
Increasers at the male connection of the
damper (Fig.2).
• Installation of the Damper in the flue
venting of an appliance should be at the
breech of the appliance or as close as
possible.
• Lock the Damper position to the 90 degree
value so that it is in the full open position.
• Ensure the female end is pointing away
from the appliance.
• Once the damper has been correctly
installed in the venting flue, lock the damper
to 90° and then operate the burner until
the appliance is sufficiently warmed up and
chamber pressure has stabilized.
• After the chamber pressure is lower than
what is prescribed by the OEM, proceed
WEIGHT
CORRECT
ORIENTATION OF
SHAFT AXIS INCORRECT
ORIENTATION OF
SHAFT AXIS
WEIGHT
Figure 1