30 www.hotwater
.com 100324051_2000579115
_Rev. 01
MULTIPLE CONCENTRIC VENT TERMINATION
When two concentric vent kits are being installed, the vent
hood centers shall be either less than 9.5” apart or more
than 43.5” apart. Spacings between 9.5” and 43.5” are not
allowed due to the possibility of exhaust cross circulation
(see Figure 32).
When more than 2 kits are installed only 2 of them shall
be less than 9.5” apart. Never install 3 termination kits
together less than 9.5” apart (see Figure 33).
9.5” MAX OR
43.5” MIN
WALL
VENT SCREEN
NOTE: IF A
TERMINATION
ELBOW IS
REQUIRED BY
LOCAL CODES
INSTALL VENT
SCREEN
IN ELBOW
INSTEAD OF
CONCENTRIC
VENT
EXHAUST.
Figure 32.
43.5”
MIN.
9.5” MAX.
WALL
NOTE: IF A TERMINATION ELBOW IS
REQUIRED BY LOCAL CODES INSTALL
VENT SCREEN IN ELBOW INSTEAD OF
CONCENTRIC VENT EXHAUST.
VENT SCREEN
Figure 33.
TEE TERMINATION (SIDEWALL & ROOF)
A Tee fitting as the exhaust termination and a 90° fitting
as the air intake termination are permitted on the water
heater models listed in Table 4.
WATER HEATER
MODEL
MAX. EQUIV.
VENT LENGTH
VENT
DIAM.
40gal, 40k BTU/hr
50’
2”
50gal, 40k BTU/hr
50’
2”
Table 4.
When a Tee termination is used, two additional
vent screens must be purchased and installed (see
Figure 34 and Figure 35). On installations of venting
less than 20’, a restrictive vent screen must be used. On
installations over 20’ a debris vent screen must be used
(see Figure 38).
12” MIN.*
APPLY SEALANT
TO BOTH SIDES
OF WALL
VENT SCREEN
- INSTALL IN
TERMINATIONS
*OR 12” ABOVE ANTICIPATED
SNOW LEVEL
TEE FITTING
EXHAUST
TERMINATION
90° ELBOW
AIR INTAKE
TERMINATION
VENT SCREEN
- INSTALL IN
TERMINATION
8” MIN.
Figure 34.
24” MAX.
APPLY
SEALANT
TO BOTH
SIDES OF
WALL
VENT SCREEN
(INSTALL IN
TERMINATION)
*OR 12” ABOVE ANTICIPATED
SNOW LEVEL
TEE FITTING
EXHAUST
TERMINATION
90° ELBOW
AIR INTAKE
TERMINATION
VENT SCREEN
(INSTALL IN
TERMINATION)
12” MIN.*
VENT SCREEN
(INSTALL IN
TERMINATION)
WALL MOUNTED
SUPPORT BRACKET
8” MIN.
Figure 35.
A
B
1”
EXHAUST
VENT
TERMINAL
INTAKE
VENT
TERMINAL
1”
“A” & “B”:12” ABOVE
ANTICIPATED SNOW
LEVEL OR 12” MIN.
ABOVE ROOF.
VENT SCREEN
- INSTALL IN
TERMINATIONS
8” MIN.
Figure 36.
