Multiple Concentric Vent Installations; Vent Pipe Length - GSW 6G40NAV Mode D'emploi

ORIENTATION OF EXHAUST PIPING AND COMBUSTION AIR PIPING RELATIVE
TO EACH OTHER MAY BE VERTICAL (AS SHOWN) OR AT ANY OTHER ANGLE
TO SUIT THE INSTALLATION.
EXHAUST
COMBUSTION
AIR
Figure 23
VENT DIA.
2"
3"
Table 2
Figure 23 illustrates the concentric vent kit for a horizontal
(side wall) installation. To prevent rain water from entering
the exhaust outlet, slope the vent kit at a downward pitch
of 6mm (1/4") per 1.5m (5') away from the inside wall.
Ensure the combustion air intake location is above the
anticipated snow level.

Multiple Concentric Vent Installations

When two concentric vent kits are being installed, the
vent hood centers shall be either less than 240mm (9.5")
apart or more than 1.1m (43.5") apart. Spacings between
240mm (9.5") and 1.1m (43.5") are not allowed due to the
possibility of exhaust cross circulation (see Figure 24).
When more than 2 kits are installed only 2 of them shall be
less than 240mm (9.5") apart. Never install 3 termination
kits together less than 240mm (9.5") apart (see Figure 25).
WALL
Figure 24
26
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STRAP (FIELD
SUPPLIED)
SLOPE 6mm (1/4")
OVER 1.5m (5')
ELBOW (FIELD
SUPPLIED)
P/N
9008586005
9006328005
O R
.5 ") M A X
2 4 0 m m (9
") M IN
1 .1 m (4 3 .5
NOTE: IF AN
ELBOW IS
REQUIRED
BY LOCAL
CODES
INSTALL
SCREEN
IN ELBOW
INSTEAD OF
CONCENTRIC
VENT
EXHAUST.
SCREEN
www. gsw-wh .com
COMBUSTION
AIR
WALL
NOTE: IF AN ELBOW IS REQUIRED BY
LOCAL CODES INSTALL SCREEN IN ELBOW
INSTEAD OF CONCENTRIC VENT EXHAUST.
2 4 0 m m
(9 .5 ")
M A X ..
Figure 25

Vent Pipe Length

The maximum allowable pipe lengths for air intake and
exhaust are listed in Table 3. The specifi ed maximum
lengths are for each of the intake and exhaust systems
and not for the combined lengths of both systems. In
addition, each system requires a 45° long sweep elbow
termination with a restrictive screen. Minimum pipe length
is 0.914m (3') with a minimum of one 90° elbow per side
(intake and exhaust).
1. Determine termination type and pipe size.
2. Determine number of elbows in vent system. Do not
include termination elbow. Calculate the maximum
equivalent length of the exhaust and air intake system.
90° SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
Figure 26
PIPE NIPPLE (USE
WITH ELBOW)
90° ELBOW
(SEE LOCAL
CODES)
25mm (1") MAXIMUM
SCREEN INSIDE
1 .1 m (4 3 .5 ")
M IN .
SCREEN WALL
90° LONG SWEEP ELBOW
(LESS RESTRICTIVE)
328765-000