Takagi T-H3J-DV / 240H Installation Manual And Owner's Manual page 16

<How to install plastic venting>
76 mm (3") vent connection Diagram
1. Connect a 76 mm (3") coupling directly on
the exhaust and intake vent collars of the
water heater.
2. Connect a 76 mm (3") plastic straight pipe
to the coupling.
From 76 mm (3") to 102 mm (4") vent connection Diagram
1. Connect a 76 mm (3") x 102 mm (4")
plastic reducer coupling directly on the
exhaust and intake vent collars of the
water heater.
2. Connect a 102 mm (4") plastic straight
pipe to the reducer coupling.
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed airtight.
All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed
aluminum adhesive tape having a minimum temperature rating of 71 °C (160 °F). For best results, a vent
system should be as short and straight as possible.
• These models are a Category IV appliance and must be vented accordingly with any 4" vent
approved for use with Category III/IV or Special BH type gas vent.
• The manufacturer
manufacturers: ProTech Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T Vent).
• Follow the vent pipe manufacturer's instructions when installing the vent pipe.
• Do not terminate vent into a chimney. If the vent must go through the chimney, the vent must
run all the way through the chimney with Category III / IV approved or Special BH vent pipe.)
• The maximum length of exhaust vent piping must not exceed 30.5 m (100 ft.) (deducting 1.5 m
(5 ft.) for each elbow used in the venting system). Do not use more than 5 elbows.
• When the horizontal vent run exceeds 1.5 m (5 ft.), support the vent run at 0.9 m (3 ft.) intervals
with overhead hangers.
76 mm (3")
plastic straight pipe
102 mm (4")
plastic straight pipe
76mm (3") x 102 mm (4")
plastic reducer coupling
Intake vent collar
(Female)
-Exhaust vent (Stainless steel vent)-
recommends the Flexmaster line. However, the following are also UL listed
16
76 mm (3")
coupling
Intake vent collar
(Female)
Page
Installation Manual
Installation
76 mm (3")
plastic straight pipe
76 mm (3")
coupling
Exhaust vent collar
(Female)
102 mm (4")
plastic straight pipe
76mm (3") x 102 mm (4")
plastic reducer coupling
Exhaust vent collar
(Female)