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INST 396 Jacuzzi® J-HN Series Heater V12-16
HORIZONTAL OR VERTICAL VENTING REQUIREMENTS FOR CATEGORY III, POSITIVE
PRESSURE VENTS
The Jacuzzi® J-HN series heater is a category III gas appliance which requires the use of approved/listed Category III vent pipe and
fittings. The heater is a semi-premix burner, forced-draft design which uses positive pressure to force flue gases through the vent
pipe to the outside. As flue gases are under positive pressure, they may escape into the building if there are any cracks or loose
joints in the vent pipe or its fittings, or with a faulty installation. The Category III vent pipe must be of a sealed-seam construction,
listed for use with Category III gas appliances with flue gas temperatures less than 400 °F (204 °C) . The Jacuzzi® J-HN series
heaters operates with maximum exhaust (flue) gas temperatures of approximately 446°F (230°C). Vent pipes meeting the
requirements of UL 1738 and of an approved non-corrosive material, such as aluminium, stainless steel, or galvanized steel are
acceptable for use with this appliance. (Selkirk Saf-T-Vent EZ Seal products are one acceptable source). For long vent runs, a
condensate leg, located near the heater may be necessary to handle vent pipe condensation. The use of listed approved roof jacks,
thimbles, and/or side vent terminals are required – the manufacturers of these vent accessories and vent pipe have their own
clearance requirements – consult the respective manufactures literature. In the absence of vent manufactures requirements, the
requirements of the Uniform mechanical code must be met. It is recommended that vent runs over 25 ft (8.5 Meters) may need to
be insulated, or of special sealed-seam double wall construction to reduce vent condensation problems which may require the use of
condensate leg in the vent of system, typically placed immediately after the heater. Condensation problems may be aggravated in
installations in cold prevailing climates. Short horizontally terminated vent runs of fewer than 10 ft (3 meters) typically do not have
condensation issues.
The Jacuzzi® J-HN series heater is listed for use with horizontal through-the-wall venting, when a proper listed side wall vent
terminal is used. The following is a list of Manufactures and model numbers of side-wall vent terminals acceptable for use with the
Jacuzzi® J-HN Series heater.
SIDE VENT TEMINALS SUITABLE FOR USE WITH Jacuzzi® J-HN series Heaters
FOR HORIZONTAL, CATEGORY III VENT SYSTEMS
Tjernlund Model VH1-6” Vent Hood (reqs. A 6 in to 5 in dia reducing adaptor
Saf – T – Vent EZ Seal Model 5590Cl Special Gas Vent, 5 in dia.
When installing a (horizontal) listed side vent terminal, following all the instructions and recommendations of the respective vent’s
manufacturer for connection to the heaters vent pipe.
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