GP-MSEM-BX-03B
SEM(U) / IT(U) Manual
RD: Sept, 2005
RL: 03B
KH
11. FLUE VENTING
INDIRECT VENTED APPLICATION
DIRECT VENTED APPLICATION
A length of ‘C’ Vent is to be installed on the
swaged end of the last tube before any Elbow
or Vent Cap is fitted. When the heater is in-
stalled and indirectly vented, it is required in
Canada that the heater be electrically inter-
locked to an independent exhaust fan by
means of an Air Proving Switch. The exhaust
fan must be sized to create 3CFM for every
1000 Btu/hr or fraction thereof, of total input
of installed equipment. Consult CSA.B149.1-
00 latest edition for requirements.
In the USA when a heater is installed un-
vented the system requires consideration of
normal infiltration and introduction of outside
air by natural or mechanical means, and/or
electrically interlocked to an independent ex-
haust fan. Consult your local codes and ANSI
Z223.1 latest edition. for all venting require-
ments, and practices.
A length of ‘C’ Vent is to be installed on the
swaged end of the last tube before any Elbow
is fitted. All venting must be single wall "C"
vent except that portion of vent passing
through a combustible wall or roof then type
"B" vent may be used as per CSA's interim
requirement. When venting horizontally, the
flue vent system must slope downwards ap-
proximately 1/4" per foot toward the vent ter-
minal, starting at the termination of the radi-
ant
tube.
For horizontal through the wall
venting, the approved 4" or 6" horizontal wall
vent terminal should be used and mounted
18" from the outside wall to the inside edge
of terminal opening. The flue vent terminal
used must be of the approved type supplied
by the manufacturer or by an approved "B"
vent manufacturer. It is the responsibility of
the installer to be familiar with current local
codes or ANSI Z223.1 / CSA.B149.1-00 lat-
est editions for all venting requirements, and
practices.
T
HIS
SEM(U) / IT(U)
SERIES
IS
APPROVED
FOR
BOTH
DIRECT
AND
INDIRECT
VENTING
APPLICATIONS
. T
HE
SYSTEM
MUST
NOT
BE
OPERATED
WITHIN
A
NEGATIVE
AIR
CONDITION
,
UNLESS
COMBUSTION
AIR
IS
BROUGHT
IN
FROM
OUTSIDE
DIRECTLY
TO
THE
BURNER
.
I
F
A
SEVERE
NEGATIVE
PRESSURE
IS
EXPERIENCED
OR
ANTICIPATED
,
THE
SEC-
OND
PORT
(
BARB
)
ON
THE
BLOCKED
FLUE
SWITCH
SHOULD
BE
CONNECTED
DI-
RECTLY
TO
OUTSIDE
AIR
USING
1/4”
PLASTIC
HOSE
FROM
BLOCKED
FLUE
SWITCH
TO
OUTSIDE
OF
BUILDING
(
HOSE
KIT
NOT
SUPPLIED
–
OPTIONAL
EX-
TRA
).
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