50
GTS HUMIDIFIER LX SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Vertical venting
INSTALLATION
• Never connect this humidifier to an existing chimney.
• Rigidly support the vent pipe every 3' (1 m) or less with
hangers or straps to ensure there is no movement after
installation. The humidifiers secondary heat exchanger
should not support the weight of the vent piping.
• No portion of the vent system should extend into, or
pass through, any circulation air duct or plenum.
• The vent system must terminate above the roof surface
per the National Fuel Gas Code, CAN/CGA.B149,
or National Gas Safety Code (Installation & Use)
Regulations (latest revision) requirements or governing
codes, and must include a UL or UL/CSA listed vent
cap or roof assembly, unless prohibited by governing
codes. Install a high-wind vent cap on all GTS
humidifiers.
• Install and fire-stop all vent pipe passing through floors,
ceilings, and walls with the proper clearances from
combustible material according to the National Fuel
Gas Code, Canadian Standards CAN/CGA.B149,
the National Gas Safety Code (Installation & Use)
Regulations (latest revision), or governing codes.
• In replacement installation where an existing vent
system may be used, inspect the vent system for
condition, size, type of vent material, and height to
meet the requirements in these instructions. When
connecting the humidifier to a gas vent or chimney, the
installation must be in accordance with Part 7, Venting
of Equipment, of the National Fuel Gas Code, ANSI
Z223.1; Section 7, Venting Systems and Air Supply
Appliances, of the CAN/CGA B149 Installation
Codes; The National Gas Safety Code (Installation &
Use) Regulations (latest revision), governing building
codes, and the vent manufacturer’s instructions.
FIGURE 50-1: CONCENTRIC VENT ROOF INSTALLATION
OM-7976
Flue gas
Combustion air
Support (field supplied)
Vent
Combustion air
Elbow
(field supplied)
Roof boot/flashing
(field supplied)
12" (305 mm) [18" (457
mm) for Canada] minimum
clearance above highest
anticipated snow level.
Maximum of 24" (610 mm)
above roof
