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DRI-STEEM GTS Humidifier Installation, Operation, and Maintenance Manual • Page 33

• Never connect this humidifier to a chimney serving a fireplace,

unless the fireplace opening is permanently sealed off.

• Code prohibits venting into an unlined masonry or concrete

chimney.

• If this humidifier is connected to a lined, masonry chimney, the

chimney must be sized and installed according to the provisions

of the National Fuel Gas Code or Canadian CAN/CGA.B149

requirements, or governing codes.

• Vent connector serving this appliance shall not be connected into

any portion of mechanical draft systems operating under positive

pressure.

• Add insulation to any roof or wall penetration vent connector

that is exposed to ambient temperatures of 30 °F (0 °C) or

less, especially any application using single-wall vent pipe as a

connector.

• Do not insulate vent pipe exposed to outdoor weather conditions

(e.g., above roof lines).

• Install vent piping as direct as possible, with a minimum number

of turns or elbows.

• Rigidly support the vent pipe every 5' (1.5 m) or less with hangers

or straps to ensure there is no movement after installation. The

humidifier vent box 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. DRI-STEEM recommends installing a high-

wind vent cap on all GTS humidifiers.

• For vertical vent pipe terminations only: This humidifier may be

commonly vented with other listed Category I gas-fired appliances.

Total input rates of all appliances determines the vent size.

• 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.

Ve r t i c a l a n d h o r i z o n t a l v e n t i n g

( c o n t i n u e d )

W A R N I N G !

For applications where the vent pipe

terminates in a vertical position, the

horizontal length of the vent and vent

connector must not exceed the height of

the vent system unless a power venter is

used. Failure to follow these instructions

could cause ﬂue gases to exit the vent piping

causing severe personal injury or death.

Installation

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