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ASTM
SPECIFICATION
(MARKED ON
MATERIAL)
D1527
D1785
D2235
D2241
D2466
D2468
D2564
D2661
D2665
F438
F441
F442
F493
F628
F656
F891
Table 5 - Approved
Combustion-Air
and Vent Pipe, Fitting
and Cement
Materials
MATERIAL
PIPE
FITTINGS
Fittings
Fittings
Fittings
Fittings
Fittings
SOLVENT
CEMENT
AND PRIMERS
Solvent
Cement
Solvent
Cement
Solvent
Cement
Primer
ABS
Pipe
PVC
Pipe
For ABS
PVC
Pipe
PVC
ABS
For PVC
ABS
Pipe
PVC
Pipe
CPVC
CPVC
Pipe
CPVC
Pipe
For CPVC
ABS
Pipe
For PVC
PVC
Pipe
DESCRIPTION
Schedule40
Schedule40
For ABS
SDR21
& SDR26
Schedule40
Schedule40
For PVC
DWV at Schedule40 IPS sizes
DWV
Schedule40
Schedule40
SDR
For CPVC
Cellular Core DWV at Schedule40
IPS sizes
For PVC
Cellular Core Schedule 40 & DWV
Installation
Guidelines
for Combustion
Air Pipe and Vent
It is
recommended
that
all
pipes
be
cut,
prepared,
and
preassembled
before permanently
cementing
any joint.
1. Attach combustion
air pipe and vent pipe per instructions
in sections
"Combustion
Air Pipe" and "Vent Pipe."
2. Working
from
furnace
to outside,
cut pipe
to required
length(s).
3. Deburr
inside and outside
of pipe.
4. Chamfer
outside
edge
of pipe
for better
distribution
of
primer and cement.
5. Clean and dry all surfaces
to be joined.
6. Check dry fit of pipe and mark insertion
depth on pipe.
7. After pipes have been cut and preassembled,
apply gener-
ous layer of cement
primer to pipe fitting socket
and end
of pipe to insertion
mark. Quickly
apply
approved
cement
to end of pipe and fitting
socket (over primer).
Apply
ce-
ment in a light, unifom_ coat on inside of socket to prevent
buildup
of excess cement.
Apply
second
coat.
8. While
cement
is still wet, twist
pipe into socket
with
1/4
turn. Be sure pipe is fully inserted
into fitting socket.
9. Wipe excess cement
from joint.
A continuous
bead of ce-
ment will be visible
around
perimeter
of a properly
made
joint.
10. Handle
pipe joints
carefully
until cement
sets.
11. Horizontal
portions
of the venting
system shall be suppor-
ted to prevent
sagging.
Support
combustion
air piping and
vent piping
a n_ininmm
of every 5 ft. (1.5M)(3
ft. (.91M)
for SDR-21
or -26 PVC) using
perforated
metal hanging
strap.
12. Slope
combustion
air piping
and vent piping
downward
towards
furnace
a minimum
of l/4-in,
per linear ft. with
no sags between
hangers.
13. Horizontal
portions
of the venting
system
shall be installed
so as to prevent
the accumulation
of condensate.
14. Use appropriate
methods
to seal openings
where combus-
tion air pipe and vent pipe pass through
roof or sidewall.
Combustion-Air
and Vent Pipe Diameter
Determine
combustion-air
and vent pipe diameter.
1. Using Table 7, individually
determine
the diameter
of the
combustion-air
and vent pipe allowed.
If different,
pick
the larger of these two diameters
and use this diameter
for
both combustion-air
and vent pipes.
2. When installing
vent systems
of short pipe length,
use the
smallest
allowable
pipe
diameter.
Do not use
pipe size
greater than required
or incomplete
combustion,
flame dis-
turbance,
or flame sense lockout
may occur.
NOTE:
Do not count elbows
or pipe sections
in terminations
or
within furnace.
NOTE:
A 2-in.
diameter
pipe
must
be used
within
furnace
casing.
Make all pipe diameter
transitions
outside
furnace casing.
29
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