34 100299634_2000545244_ Rev. A
Vent Screens
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
Failure to install the appropriate screen could
result in improper heater operation with
attendant risk of property damage, personal
injury or death by fire or carbon monoxide
poisoning.
Breathing Hazard - Carbon Monoxide Gas
WARNING
The vent kit supplied with this water heater includes one
(1) pair of restrictive vent screens and one (1) pair of debris
screens (see Figure 37). For safety and optimum efficiency
performance, ensure the correct vent screen is installed
for the vent length in your installation. These screens have
been sized to ensure maximum energy efficiency of the
vent system based on the “equivalent length” of the vent
piping. Choose only the restrictive screen that matches
your venting configuration. (see Figure 37, Table 5 and
Table 6). When required, the restrictive vent screen MUST
be installed for proper operation of the water heater. How
to determine the “equivalent length” is shown in Table 4.
When required, the restrictive screens may be located at
the termination or next to the blower. In freezing weather
it is recommended to locate the restrictive screens next
to the blower to reduce the potential for frost buildup on
the intake screen.
• Install the appropriate restrictive vent screen into the
vent system.
• Install the debris vent screen in both the air intake pipe
and the exhaust pipe.
• The debris screens are to be installed at the termination
to keep foreign materials out of the venting.
• If there are restrictive screens installed at the
termination, the debris screens are not required.
• Restrictive vent screens in the termination must be
secured with corrosion resistant sheet metal screws.
This will allow for easy removal for inspection and
cleaning.
• The debris vent screens are self-securing.
Note: The same vent screen type (restrictive or debris)
should be installed in the intake and the exhaust piping. In
the concentric vent application, the screen is to be installed
in the exhaust piping only.
VENT
SIZE
(INSIDE
DIAM.)
VENT SCREEN
RESTRICTIVE DEBRIS
3”
(76k
BTU/hr
models)
FOR VENT LENGTH
LESS THAN OR EQUAL
TO 20 EQUIVALENT
FT. USE THIS SCREEN
(SUPPLIED).
4”
Figure 37.
#6 SHEET
METAL
SCREW
ELBOW
#6 SHEET
METAL
SCREW
(FIELD
SUPPLIED)
PLASTIC
SCREEN
SHOULDER
OPEN
POCKET
CLOSED
POCKET
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