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Alternative Arrangements / Optional Equipment for
Venting
Horizontal Venting
This heater, when horizontally vented, must be installed
with the approved venting system. For horizontal vent
installations the GSP45 tube heater is certified as a
category III appliance.
a) In combustible or noncombustible walls, use vent kits
on page 3. Follow vent manufacturer's instructions
for proper installation.
b) Four (4") inch [10.16 cm] O.D. flue pipe is required.
Twenty five (25') feet [7.62 m] maximum length is
recommended.
c) All flue joints should be sealed using suitable product
such as General Electric RTV 106 or Permatex Form-
A-Gasket Red High Temperature Silicone Adhesive
Sealant.
d) Vent terminal should be installed at a height
sufficient to prevent blockage by snow.
e) Building materials should be protected from
degradation by flue gases.
Roof or Building Overhang
Single Wall
Single wall vent run
Single wall terminal end
24" Min.
(0.61 m)
Wall
2" (5.08 cm) clearance
thimble required when
flue pipe extends through
combustible materials
Roof or Building Overhang
8" to 10" Max
(20.32 cm to 25.4 cm Max)
Double Wall
Double wall vent run
Double wall terminal end
Clearance to be as
specified on type "B"
vent pipe.
Vertical Venting
This heater, when vertically vented, must be installed with
the approved venting system. For vertical vent installations
the GSP45 tube heater is certified as a category I appliance.
a) Four (4") inch [(10.16 cm) ] O.D. flue pipe, maximum
twenty five (25') [7.62 M] feet in length may be
used as shown with approved vent cap.
b) An insulated thimble may be required to pass
through combustible structures (check local codes)
3'-0" Min.
(0.91 m to 0 m Min)
6'-0" Min
(1.82 m to 0 m Min)
Note position of vent cap
openings.
Pitch flue pipe down
toward outlet ¼ per foot
for condensate drainage.
2" (5.08 cm)
clearance thimble
3'-0" Min.
(0.91 m to 0 m Min)
24" Min.
(0.61 m)
6'-0" Min
(1.82 m to 0 m Min)
Note position of vent cap
openings.
Pitch flue pipe down toward
outlet ¼" per foot
[0.635 cm per 0.3m]
Wall
for condensate drainage.
Gas-Fired Low-Intensity Infrared Heater
c) All flue joints should be sealed using suitable products
(see recommendation for horizontal venting).
Heater
Heater Exhaust Vent
Air For Combustion
If indoor combustion air is to be supplied for a tightly
enclosed area, one square inch of free area opening shall
be provided below the heater for each 1,000 BTU/hr of
heater input (6.45 square cm per 0.293 kW).
When outside air is used, the opening below the heater
shall be one square inch of free area for each 4,000 BTU/
hr of heater input (6.45 square cm per 1.172kW). In
contaminated atmospheres or high humidity areas, optional
outside air for combustion is recommended.
Adequate clearances around the perforated fresh air plate
must be maintained at all times. In larger open areas of
buildings, infiltration normally is adequate to provide air for
combustion.
Direct Outside Air For Combustion
Outside combustion air should be supplied directly to the
heater when the building is subject to negative pressure
or contaminants are present in the building air. These
contaminates include paints, solvents, corrosive vapors or
any other foreign particles that may cause damage to the
heater or result in poor combustion.
Outside combustion air can be brought directly to the
heater by a 3 inch (7.62 cm) diameter duct less than 25
feet (7.62 m) long or equivalent. This is attached to a 3
inch (7.62 cm) starting collar that is fitted on inlet side of
the control cabinet. An approved vent cap must be placed
directly to the end of the outside combustion air inlet
pipe. The combustion air inlet should be a minimum of 1
foot (0.3 m), either vertically or horizontally from the flue
vent termination. The air intake terminal must be located
not less than one foot (0.3 m) above grade. It is good
installation practice to supply combustion air from the
same pressure zone as the vent outlet.
In colder climates, where necessary, insult the fresh air
duct. Avoid location the fresh air duct directly above the
control box. Provide a capped clean out T as necessary.
The GSP tube heater is approved for installation with
an outside air supply system. Some compounds such as
halogenated hydrocarbons or other corrosive chemicals
14
Operating Instructions and Owner's Manual
Type "B" Vent
(required outdoors)
24 Inches
Roof Flashing
(0.61 m)
Approved Thimble
(if Applicable)
Single Wall Pipe
Secure all joints with 3 (minimum) #8 x 3/8"
sheet metal screws and seal all joints
Vent Cap
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