Schwank builderSchwank S100U User Manual
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S100-F / ITB-F I&O Manual
IM101230
RD: SEP 2014
RL: 11A
13. COMBUSTION AIR DUCTING
Do not install filters on the combustion air intake. Ensure adequate clearance around
the air intake to allow sufficient combustion air supply to the heater.
This heater requires optional 4” Fresh Air Intake Adapter JS-0532-SE to connect a com-
bustion air duct at the top of the burner. Standard air duct is 4” diameter, but can be in-
creased to 5” diameter (reduce to 4” at burner) to provide up to an additional 20 feet of
duct length. Vent size must remain at 4” for single vent or 6” for combined vent of two
heaters - do not increase vent size.
Combustion air duct must be constructed of noncombustible material. Do not use a ‘soft wall’
flexible hose for air duct, the corrugated sides of this tubing will contract and restrict air flow. A
good quality industry approved hard-wall flex is allowed.
When a tube heater is operated in a negative air condition or air-born dust or contaminants are
present as in woodworking and welding shops, air for combustion must be ducted from outside
the negative or contaminated area to the 4 inch (10 cm) diameter intake flange supplied on the
blower. Maximum system, vent and duct length is listed above.
Do not exceed lengths listed above for total system and individual vent or air duct
Total combined system length is reduced by five feet for every 90° elbow installed in the
vent or duct and in the tube system (see above for allowable total lengths)
Exceeding the allowable lengths may create condensation or soot conditions and will void
CSA Design Certification and product warranty
The air intake will not be located less than:
Three feet above grade
Twelve inches from flue vent terminal of any heater with input up to 100,000 Btu/hr
Three feet from flue vent terminal of any heater over 100,000 Btu/hr
This heater has an optional fresh air intake duct hood for wall (JS-0532-VC) or roof cap (JS-
0530-XX) to bring combustion air to the heater from outside. Ensure adequate clearance
around the air intake to allow sufficient combustion air supply to the heater. If drawing fresh air
from outside, it is recommended that any single wall pipe containing cold air be insulated to
prevent or reduce condensation on the pipe.
CAUTION: In locations where chlorinated Hydrocarbons are in use, such as Trichloroethyl-
ene or Chloroethylene Nu it is essential that combustion air be brought in from
a non-contaminated area. Burning the fumes from these gases will create Hy-
drochloric acid fumes, which are detrimental to humans, equipment and build-
ings. Typical sources of other contaminants are paint removers, paints, refriger-
ants, solvents, adhesives, degreasers, lubricants, pesticides, etc.
The heater manufacturer cannot anticipate all types and chemical composition of
possible contaminants at project sites. Confer with project site safety, health and
engineering staff and/or local authorities having jurisdiction such as the Fire Mar-
shall and Department of Labor for possible contaminants and any conflict with the
installation of hot surface heating equipment.