A.O. Smith T-H3M-DV Installation Manual And Owner's Manual page 14

3 inch vent installation
Vent connections for two-pipe
3" straight pipe
3" coupling
(included)
Intake vent
collar
(Female)
1. Connect 3" couplings directly on
the exhaust and intake vent collar
of the water heater
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
2. Connect 3" straight pipes to the
couplings
For details of the optional items, refer to the Installation manual for each optional item
4 inch vent installation
Vent connections for two-pipe
4" straight
pipe
3"x4"
increaser
Intake vent
collar
(Female)
1. Connect 3"x4" increasers
directly on the exhaust and intake
vent collar of the water heater
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
2. Connect 4" straight pipes to
the increasers
For details of the optional items, refer to the Installation manual for each optional item
3" straight pipe
3" coupling
(included)
Exhaust
vent collar
(Female)
4" straight
pipe
* 3" elbow with
bird screen
3"x4" increaser
Intake vent
collar
(Female)
Exhaust
vent
collar
(Female)
14
Page
Installation Manual
Vent connections for single pipe
3" straight pipe
* 3" elbow with
bird screen
Intake vent
collar
(Female)
*The water heater came with a metal screen
that will fit into a 3 inch elbow
1. Connect a 3" elbow directly on the
intake vent collar of the water heater
2. Connect a 3" coupling directly on the
exhaust vent collar of the water heater
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
3. Connect a 3" straight pipe to
the coupling
Vent connections for single pipe
4" straight pipe
3"x4" increaser
*The water heater came with a metal screen
that will fit into a 3 inch elbow
1. Connect a 3" elbow directly on the
intake vent collar of the water heater
2. Connect a 3"x4" increaser directly on
the exhaust vent collar of the water
heater
Make sure the couplings engage
the o-rings installed in the intake
and exhaust vent collars
3. Connect a 4" straight pipe to
the increaser
Installation
3" coupling (included)
Exhaust
vent collar
(Female)
Exhaust vent
collar (Female)