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11. FLUE VENTING - RADIANT TUBE HEATER
IMPORTANT
Vertical Vent Through Roof (Category I): For vertical vent, this tube heater series operates
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with a negative static vent pressure and a vent temperature that does not result in excessive
condensate in the vent and is defined as a Category I appliance. Refer to details below.
Horizontal Vent Through Wall (Category III): For horizontal vent, this tube heater series op-
◼
erates with a positive static vent pressure and a vent temperature that does not result in exces-
sive condensate in the vent and is considered a Category III appliance. Refer to details below.
WARNING
vent connections with high temperature sealant. Venting must be in accordance with all local,
state, provincial, and national codes (ANSI Z223.1/NFPA 54 in USA; B149.1 in Canada) and as
indicated below in this manual.
This tube heater is certified for venting directly to the outside or unvent-
ed (indirect venting) applications.
UNVENTED (INDIRECT MECHANICAL VENTING SYSTEM)
USA: Natural or mechanical means shall be provided to supply and exhaust at least 4ft
min/1000Btuh (0.38m
electrical interlock to a dedicated exhaust fan. Exhaust must be located as high as practicable
in the structure above the level of the heater(s). Consult your local code and ANSI Z223.1 lat-
est edition for all venting requirements and practices.
Canada: It is required that the heater(s) be electrically interlocked to dedicated exhaust fan(s)
by means of an Air Proving Switch. Exhaust fan(s) must be sized to create 300 cfm (8.5 cu m/
min) exhaust for every 100,000 Btuh (30 kW) or any fraction thereof of total input of installed
equipment. Exhaust must be located as high as practicable in the structure above the level of
the heater(s). Sufficient supply air must be provided. Consult the latest edition of CSA.B149.1
Section 8 for venting system and air supply requirements.
VENTED TO THE OUTSIDE - GENERAL REQUIREMENTS
It is the responsibility of the installer to adhere to these instructions and all current local codes and/
or ANSI Z223.1 (NFPA 54) or CSA.B149.1 latest editions for all venting requirements, and practic-
es. All vent pipe will be certified to meet Category I (vertical vent) or Category III (horizontal vent)
appliance requirements, depending on the vent configuration of a particular installation.
It is a normal condition that during heat-up and cool-down a tube heater will expand and contract.
Allowances for heater expansion must be made in the venting and combustion air ducting. Improp-
er installation can result in property damage, injury or death.
When vented: The system must not be operated in a negative air condition unless combus-
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tion air is ducted from outside to the burner. If negative pressure is experienced or anticipat-
ed, the open port (barb) on each of the blocked flue and proving air switches must be Tee'd
together and connected directly to outside air using a field supplied 1/4" plastic hose from the
tee between the switches to outside of building.
All approved vent pipe, connectors, and adapters are supplied locally by others according to
◼
Effective January 1, 2019: Changes to the ANSI/CSA standard that gov-
erns Radiant Tube Heaters specify the following appliance CATEGO-
RIES and VENTING:
Inadequate venting of a heater may result in asphyxiation, carbon monoxide
poisoning, injury or death. This heater may use a vent connection or indirect
venting system to remove products of combustion from the space. Seal all
3
/min/kW) input of installed heaters. Some local codes may require an
29
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
3
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