As
the exhaust pipe length and number
of
bends
increases, larger pipe is required to eliminate exces-
sive exhaust restriction and back pressure.
PIPESIZE (INCHES)
LENGTH IN FEET
AND METRES
(1.5-Inch
Muffler)
LENGTH IN FEET
AND METRES
(2-Inch
Muffler)
The chart below shows the maximum equivalent
exhaust pipe length for exhaust systems using
1-1/2
through
3
inch pipe.
Also
shown are the equivalent
lengths of various pipe fittings. The
TOTAL
exhaust
system equivalent length (including all fittings and
muffler) should not exceed the length shown in the
chart for the size of pipe used. Use a manometer to
verify that back pressure does not exceed
27
inches
(686
rnm) H20.
1.5 1.75 2.0 2.5
3
4 9 18 49 160
(1.2) (2.7)
(5.5) (15) (49)
17 35 70 188 614
(5.2)
(11)
(21) (57) (187)
MAXIMUM EQUIVALENT EXHAUST PIPE
LENGTH-ONE CRITICAL MUFFLER INCLUDED
EQUIVALENT LENGTHS OF PIPE FITTINGS
TYPE OF FITTING
(INCHES)
STANDARD ELBOW
Feet (Metres)
LONG RAD. ELBOW
Feet (Metres)
MED. RAD. ELBOW
Feet (Metres)
STANDARD TEE
Feet (Metres)
1.5
I
2
(1.34) (1.62)
(0.85) (1.07)
(1.10) (1.40)
(2.83) (3.96)
9.3
2.5
6.4
(1.95)
4.2
(1.28)
5.4
(1.64)
14
(4.27)
3
8.1
(2.47)
5.2
(1.58)
6.8
(2.07)
17
(5.18)
SINGLE THIMBLE DIAMETER
DOUBLE VENTILATED THIMBLE
DIAMETER
6"(
I52
mm)
LARGER
THAN EXHAUST LINE
I~"~OS
mm)
LARGER
OR
s
IN END
SLEEVE
EXHAUST LINE PASSING THROUGH
II
WALL OR PARTITION
FIGURE
4.
EXHAUST SHIELD
\
IF
EXHAUST LINE MUST BE PITCHED
UPWARD CONSTRUCT A TRAP
OF
PIPE
FITTINGS AT POINT OF RISE
DRAIN CONDENSATION TRAP
PE RlODlCALLY
AG17
FIGURE 5. CONDENSATION TRAP
WARNING^
EXHAUST GAS
IS
DEADLY!
Exhaust gases contain carbon monoxide, a poisonous gas that might cause
unconsciousness and death. It is an odorless and colorless gas formed during
combustion of hydrocarbon fuels. Symptoms of carbon monoxide poisoning
are:
Dizziness Vomiting
Headache Muscular Twitching
Weakness and Sleepiness
Throbbing in Temples
If you experience any of these symptoms, get out into fresh air immediately,
shut down the unit and
do
not use until it has been inspected.
The best protection against carbon monoxide inhalation is proper installation
and regular, frequent inspections of the complete exhaust system.
If
you notice
a change in the sound or appearance of exhaust system, shut the unit down
immediately and have it inspected and repaired at once by a competent
mechanic.
15
Redistribution or publication of this document,
by any means, is strictly prohibited.
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