Specifications

12
• No portion of the vent system shall extend into, or pass
through, any circulation air duct or plenum.
• The Type B vent system shall terminate above the roof
surface per the National Fuel Gas Code or CAN/
CGA.B149 requirements, and shall include a UL or CUL
listed vent cap or roof assembly, unless prohibited by
local codes.
• This humidifier may be commonly vented with other
listed gas-fired appliances. Total input rates of all appli-
ances will determine the vent size.
• All vent pipe passing through floors, ceilings, and walls
must be installed with the proper clearances from combus-
tible material, and be fire-stopped according to the
National Fuel Gas Code requirements and Canadian
Standards CAN/CGA.B149.
• In replacement installation, where an existing vent
system may be used, the vent system must be inspected
for condition, size, type of vent material, and height to
meet the requirements in these instructions. If the
existing vent system is too large, condensation could
occur, causing corrosion of the vent system. Installing a
replacement vent system may be required. When con-
necting the humidifier to a gas vent or chimney, the
installations shall be in accordance with Part 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI Z223.1,
or Section 7, Venting Systems and Air Supply Appliances,
of the CAN/CGA B149 Installation Codes, the local
building codes, and the vent manufacturer's instructions.
• For all applications, the horizontal length of the vent and
vent connector must not exceed the height of the vent
system.
Special Horizontal Venting Requirements
• Distances from the vent terminal adjacent public
walkways, buildings, and openable windows and building
openings should be consistent with the National Fuel Gas
Code, ANSI Z223.1, and/or CAN/CGA B149 Installation
Codes.
• The vent terminal and air intake locations must be at
sufficient height above ground level to prevent blocking by
expected snowfall.
• Building materials should be protected from degrada-
tion by flue gases.
• A minimum horizontal clearance of 4 feet (1.22m) from
electric meters, gas meters, regulators, and relief
equipment must be maintained.
INSTALLATION
• 60' maximum, 10' minimum equivalent length of vent pipe.
• A vent box pressure of -.01" w.c. is specified and set by
adjusting power venter and barometric damper, with all
burners running.
• Maximum of 4 elbows
• Vent pipe is single wall or B vent for GTS-300, 150, 75.
• Vent pipe is single wall only on GTS-400, 200, and 100.
Equipment Required for Horizontal Venting
• Power Venter: Field controls, see above table for
model numbers.
• Barometric Damper: Field controls model # MG-1 (5").
• Vent Terminal: Field controls, see above table for
model numbers.
Power Venter
Barometric
Draft Control
GTS Humidifier
X
X
Air Intake
3½ Feet Minimum
Vent
Hood
Note: Refer to power venter manual for clearance requirements relative to
combustion air openings.
Figure 12-1: GTS Venting
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repmaD
004-STG'7)"5
(5-1-HWS006-OVP"5"5
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002,051,001,57-STG'6)"4(4-1-HWS003-OVP"4"5
Recommended Value for
X Approximately 12"
GTS-IOM-1298.pdf 12 11/17/2009 3:57:03 PM