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1/2" sheet metal screws
Install a minimum 12" [305 mm] straight vent connector before any Tee or 90° Elbow
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The connection of vent components must be secured as specified in the installation instruc-
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tions by the vent manufacturer.
For vertical vent, any horizontal vent section will slope upwards away from the heater not less
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than 1/4 inch rise per foot of run.
For horizontal vent, slope downward away from heater a maximum of 1/4 inch down per foot of
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run
When the vent pipe passes through a cold or unheated area where the ambient temperature is
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likely to produce condensation of the flue gases, the vent pipe will be insulated with a suitable
material as certified and specified by the insulation manufacturer to withstand temperature up
to 460°F (238°C).
The vent system must always be adequately supported to prevent sagging.
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The vent configuration will allow for expansion and contraction in length of the tube heater
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As an Option for vertical vent, two heaters may be vented through an approved common 4" x
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4" x 6" Vent Tee (10 x 10 x 15 cm), supplied by the manufacturer, or by using approved com-
ponents as indicated in local codes. Vent pipe from each heater is not required to be equidis-
tant to the vent Tee, but must comply with local code requirements. A common thermostat or
"ON/OFF" switch must control the two commonly vented heaters. Common vent is not allowed
for Category III horizontal vent application.
COMBINED SYSTEM LENGTH: Tube Heater + Vent + Combustion Air Duct:
Refer to Table 4 next page, COMBINED SYSTEM LENGTH: TUBE + AIR DUCT + VENT.
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Lengths in the table apply to either Vertical or Horizontal vent.
COMBINED SYSTEM LENGTH includes: Tube Heater length + combustion air duct + vent +
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elbows. Each 90° elbow in the system has an equivalent length of 5 ft.
A maximum of 2 elbows is allowed in any portion (duct, tube heater, vent) with the exception of
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up to three 90° elbows in a vertical vent run through the roof, for a total of maximum 6 (vertical
vent: 7) 90° elbows in the combined system
Combustion air duct is not to exceed lengths in table below and may be 4" or 5" diameter for
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inputs less than 200,000 Btuh, but must be 5" diameter for inputs 200,000 Btuh and greater
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5" diameter duct requires a reducer to 4" diameter at the connection to blower inlet
Exceeding the allowable lengths in the table below can create combustion and/or condensa-
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tion issues and will void Certification and the heater warranty.
Do not exceed the Maximum Combined System Length regardless of the allowed maximum
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length of individual vent or combustion air duct
13
HE+ Series Modulating Supplemental Manual
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