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

Typical installations using
Horizontal Installation
Connect between exhaust vent collar and piping.
See the instructions below.
For details of the optional items, refer to the Installation manual for each optional item.
<How to install intake and exhaust venting (two-pipe, direct-vent) with the indoor models>
3" vent connection
1. Connect 3" couplings directly on the
exhaust and intake vent collar
of the water heater.
2. Connect 3" straight pipes to the
couplings.
From 3" to 4" vent connection
1. Connect 3"x4" increasers
directly on the exhaust and intake
vent collar of the water heater.
2. Connect 4" straight pipes to
the increasers.
-Two-pipe, direct-vent illustrations-
PVC, ABS, or polypropylene vent
Wall
Intake vent collar
(Female)
Intake vent collar
(Female)
16
Vertical Installation
Roof
3" straight pipe
3" coupling
4" straight pipe
3"x4" increaser
Page
Installation Manual
Installation
Roof
flashing
Fire stop
3" straight pipe
3" coupling
Exhaust vent collar
(Female)
4" straight pipe
3"x4" increaser
Exhaust vent collar
(Female)