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SECTION 6: VENTING
17
are located and other spaces of the building.
Turn on clothes dryers and any exhaust fans,
such as range hoods and bathroom exhausts
so that they shall operate at maximum speed.
Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Follow the lighting instructions. Place the
appliance being inspected in operation. Adjust
thermostat so that the appliance will operate
continuously.
5. For any appliance having a draft hood, test for
draft hood appliance spillage at the draft hood
relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
6. After it has been determined that each
appliance connected to the venting system
properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace
dampers and any other gas-burning appliances
to their previous conditions of use.
7. If improper venting is observed during any of
the above tests, the venting system must be
corrected by a contractor qualified in the
installation and service of gas-fired equipment
or your local gas supplier. If the venting must
be resized, use appropriate tables in (US)
Appendix G of NFPA 54/ANSI Z223.1 - latest
revision, National Fuel Gas Code (US) or
Standard CSA B149.1 Natural Gas and
Propane Installation Code (Canada) to
determine minimum size. All vent corrections
must be in accordance with the appropriate
local codes and the NFPA 54/ANSI Z223.1 -
latest revision, National Fuel Gas Code (US) or
Standard CSA B149.1 Natural Gas and
Propane Installation Code (Canada).
Figure 9: Vent and Roof Detail
Figure 10: Standard Vented Heater - Vertical and Horizontal Vent Termination
Vent
Terminal
4" (10 cm)
Diameter Vent
Flashing
(By Others)
Listed
Thimble
(2" [5 cm] Clearance)
Vent Terminal
Vertical
Option
Horizontal
Option
Vent
Listed
Thimble
(2" [5 cm]
Clearance)
Flashing
(By Others)
NOTE: Vent supports not
shown.
12" (31 cm)
Minimum
Model Vent Diameter Part Number
UHA[X] 30 - 125 4" (10 cm) 90502102