Hearth and Home Technologies NOVUS GNBC33 - Manual (Page 8)

34615 Rev G 8 12-02
NOVUS B-VENT INSTALLATION INSTRUCTIONS
3. FIRESTOP SPACER/VENT INSTALLATION
Frame an opening and install a firestop spacer
whenever the vent penetrates a ceiling floor area, as
shown in Figure 6. Frame the opening with the same
sized lumber as used in the ceiling/floor joist. Unless
the flue is offset, the hole should be directly above the
appliance. DO NOT pack insulation around the vent.
Assemble vent sections with three screws per joint.
WARNING - RISK OF FIRE!
Always maintain minimum clearances or greater
around the vent system. Do not pack air spaces with
insulation or other material. The flow of combustion
and ventilation air must not be obstructed.
WARNING!
The horizontal run of vent must have a 1/4” rise for
every 1 ft. of run towards the termination. Never al-
low the vent to run downward. This could cause high
temperatures and may present a fire hazard.
WARNING!
When vent sections exceeding three feet in length
are installed between an offset/return, structural sup-
port must be provided to reduce off-center loading
and prevent vent sections from separating at the vent
joints. Follow all B-vent manufacturer guidelines.
4. CHASE/TERMINATION INSTALLATION
Figure 7 and Table 1 specify minimum vent heights for
various pitched roofs. Vent sections may have to be cut
to a certain length.
These vent heights are necessary for safety and do not
ensure draft-free operation. Trees, buildings, adjoining
roof lines, adverse conditions, etc., may create a need
for a taller vent should down drafting occur.
Figure 6
Installing the Firestop Spacer