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P/N 472089 Rev. E 4-19-05
14
INDOOR VENTING — General Requirements
The vent pipe must be the same size or larger. The MiniMax NT LN heaters are capable of a 360-degree discharge
rotation and operate with a positive vent static pressure and with a vent gas temperature less than 400° F. The total length
of the horizontal run must not exceed the length that is listed below in the tables.
NOTE
The allowable vent runs for each vent pipe diameter are different and can not be exceeded.
Each 90-degree elbow reduces the maximum horizontal vent run by 8 feet and each 45-degree elbow in
the vent run reduces the maximum vent run by 4 feet. See the tables below for the maximum vent
lengths using 90-degree and 45-degree elbows.
The MiniMax NT LN is a “Category III” appliance and is an induced-draft pool and spa
heater which uses positive pressure to push flue gases through the vent pipe to the outside.
This requires a completely sealed vent system—single wall vent pipe with sealed-seams
and joints. Flue gases under positive pressure may escape into the dwelling with any
cracks or loose joints in the vent pipe, or improper vent installation. The vent pipe must
be of a sealed-seam construction, such as those listed for use with “Category III Appliances”,
and for operating temperatures less than 400° F. The use of listed thimbles, roof jacks and/
or side vent terminals are required; and the proper clearances to combustible materials
must be maintained in accordance with type of vent pipe employed—in the absence of a
clearance recommendation by the vent pipe manufacturer, the requirements of the Uniform
Mechanical Code should be met. The ventilation air requirements for the MiniMax NT
heater can be found on page 16. It is recommended that vent
runs over 18 feet be insulated to reduce condensation related
problems and/or the use of a condensate trap in the vent run
close to the heater may be necessary in certain installations
such as cold climates. The MiniMax NT LN heater is suitable
for through-the-wall venting, see table and dimensions below.
Recommended sources for Side-wall vent hood terminals
include: The Field Controls Co. (2308 Airport Road, Kingston,
NC 28501, (800)742-8368) and Tjernlund Products Inc. (1601
Ninth Street, White Bear Lake, MN 55110, (800) 255-4208)—
consult manufacturer for model information and availability.
CAUTION
Do NOT combine exhaust vent pipes to a common exhaust
vent in multiple unit installations. Run separate vent pipes.
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Section III. Installation
Table 6.
Table 7.
Table 8.
Figure 5.
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