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The location of the vent termination must meet the requirements of the current edition of ANSI Z223.1/NFPA 54,
National Fuel Gas Code or CAN B419.1, Natural Gas and Propane Installation Code and the requirements shown on
page 25 of this manual.
Just as with any other vented device, vertical vent rise
creates draft (negative pressure) in the firebox as the
exhaust gases heat up. If this draft becomes excessive,
it can affect the performance or appearance of the fire.
The FORTY6 fireplace includes air and exhaust restrictors
that are used to balance the draft in the fireplace to the
optimal level for installations where excessive draft might
occur. The venting charts on pages 20 & 21 provide
an easy means for determining whether your specific
installation requires inlet air or exhaust restrictors or both.
To make the determination about whether air or exhaust
restrictors are needed, a venting chart worksheet is
provided on page 22. Follow the instructions and fill in the
worksheet for your particular installation. This will allow
you to determine the recommended restrictor settings
for your exact installation. Although this might appear to
be a complicated process at first glance, it is really quite
straight-forward and the result will be a fire that looks and
performs as intended. Several examples of worksheet
calculations are shown on page 23 to help guide you.
Please be sure to note that:
1. There are separate venting charts for Natural Gas and
LP Gas. Refer to the appropriate chart for your fuel type
to determine your specific restrictor requirements. The
settings in the charts have been deter-mined based on
extensive testing.
2. Determine the total vertical vent rise and total
horizontal vent run for your installation. All measure-
ments are made from the center of the vent opening in
the back of the fireplace.
3. If your fireplace will not be venting directly though an
outside wall to a horizontal termination or if more than
12" of horizontal vent run is required, some vertical
vent rise will be required for the fireplace to function
and vent properly. Elbows will also be required for
those installations. However, installations are limited
to a maximum of four 90° elbows (or 45° elbow
equivalents).
4. Note: Two 45° elbows equal one 90° elbow.
5. The recommended restrictor settings in the venting
charts allow up to two 90° elbows (or 45° elbow
equivalents) to be used without affecting the restrictor
settings. Additional elbows will require that you
calculate a new equivalent horizontal run for your
installation to account for the additional flow re-
sistance caused by the extra elbows. For the purposes
of calculating the equivalent horizontal vent run, each
additional 90° elbow is equivalent to three feet of
horizontal vent run and each additional 45° elbow is
equivalent to 1.5 feet of horizontal vent run. The total
horizontal vent run including elbow equivalents can
not exceed 10 feet.
6. The maximum vertical vent rise can not exceed 30 feet
with a 0" horizontal run, or 20 feet vertical with 10 feet
of horizontal run.
7. There are two exhaust restrictors that are provided
with your fireplace. They are labeled “A” and “B”. The A
restrictor provides less exhaust restriction than B.
8. An air restrictor plate is also provided with your
fireplace. It is a ring with bendable tabs that can be
set to adjust the amount of restriction in the air supply
system. Once the appropriate number tabs are bent
open (in accordance with the requirements for your
installation), the plate is inserted between the fireplace
and the vent starter pipe.
APPROVED VENT
TERMINATIONS
DURAVENT GS/PRO
SELKIRK DIRECT- TEMP
ICC EXCEL DIRECT
VERTICAL CAP
58DVA-VC Low Profile Cap
None Approved
TM5VT 5x8 Vertical Cap
HORIZONTAL CAP
58DVA-HC
None Approved
None Approved
SNORKEL
58DVA-SNK14 – 14" Snorkel
58DVA-SNK36 – 36" Snorkel
5DT-ST14 – 14" Snorkel
None Approved
SÓLAS Self-Calibrating Power Vent Option
Available for all SÓLAS Wall-Mount DV Models
Learn more @ solasfires.com
USING THE VENTING CHARTS
