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furnace. Amana does not encourage nor recommend
using these connectors. However, if you do choose to use
"no-hub connectors," the connectors must be gas tight,
water tight, and able to withstand continuous exposure to
the warm, moist, acidic flue products of the furnace.
It is the responsibility of the installer to follow the manufac-
turers' recommendations and to verify that all flue pipe
connectors used are compatible with the furnace flue
products. In addition the connectors must possess ad-
equate structural integrity to prevent flue pipe separations
during furnace operation.
V. Vent Piping - GUX (All Installations),
GUC (All Installations), and GUD
(One Pipe Installations)
IMPORTANT: The length of the vent pipe affects the
performance of the furnace and therefore must be care-
fully sized.
Pipe Diameter for GUC(All Models),
GUX (All Models), and GUD045 (One Pipe Venting)
# of Inside
5 to
10 to
15 to
Elbows
10 feet
15 feet
20 feet
1
2"
2"
2"
2
2"
2"
2"
3
2"
2"
2"
4
2"
2"
2"
5
2"
2"
2"
6
2"
2"
2"
7
2"
2"
2"
8
2"
2"
3"
Pipe Diameter for GUD070
(One Pipe Venting)
# of Inside
5 to
10 to
15 to
Elbows
10 feet
15 feet
20 feet
1
2"
2"
2"
2
2"
2"
2"
3
2"
2"
2"
4
2"
2"
2"
5
2"
2"
2"
6
2"
2"
2"
7
2"
2"
2"
8
2"
2"
3"
Pipe Diameter for GUD090, GUD115
(One Pipe Venting)
# of Inside
5 to
10 to
15 to
Elbows
10 feet
15 feet
20 feet
1
3"
3"
3"
2
3"
3"
3"
3
3"
3"
3"
4
3"
3"
3"
5
3"
3"
3"
6
3"
3"
3"
7
3"
3"
3"
8
3"
3"
3"
The inside feet of straight pipe and inside elbows represent
the venting system from the furnace to the inside wall.
Follow termination instructions for going from the inside
wall to the outside in the next paragraph.
When the vent pipe goes through an outside wall, the vent
20 to
25 to
30 to
35 to
40 to
25 feet
30 feet
35 feet
40 feet
45 feet
2"
2"
2"
2"
3"
2"
2"
2"
2"
3"
2"
2"
2"
3"
3"
2"
2"
3"
3"
3"
2"
2"
3"
3"
3"
2"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
20 to
25 to
30 to
35 to
40 to
25 feet
30 feet
35 feet
40 feet
45 feet
2"
2"
2"
2"
3"
2"
2"
2"
2"
3"
2"
2"
2"
3"
3"
2"
2"
3"
3"
NA
2"
2"
3"
NA
NA
2"
3"
NA
NA
NA
3"
NA
NA
NA
NA
NA
NA
NA
NA
NA
20 to
25 to
30 to
35 to
40 to
25 feet
30 feet
35 feet
40 feet
45 feet
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
3"
NA
3"
3"
3"
NA
NA
3"
3"
NA
NA
NA
3"
NA
NA
NA
NA
NA
NA
NA
NA
NA
must terminate at least one foot outside to keep moist
combustion products away from the structure. The vent
termination must be at least three feet above any forced air
inlet located within ten feet. It must be at least four feet
below, four feet horizontally from or one foot above any
door, window, or gravity air inlet into any building. The vent
must terminate at least one foot above ground level. If
heavy snow is expected locally, this distance may need to
be increased. The vent shall not terminate over public
walkways, or over an area where condensate or vapor
could create a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or other equip-
ment. Drill a 2-3/8 inch diameter hole through the wall for
2 inch pipe. (For 3 inch pipe, drill a 3-1/2 inch diameter
hole.) Cut a piece of PVC (ABS) pipe that is the thickness
of the wall plus the depth of the sockets of the fittings to be
installed on the inside and outside of the walls. To prevent
the vent pipe from moving and possibly damaging connec-
tions, locate the fitting on the inside wall and a coupling on
the outside wall as shown in Fig. 5. To prevent condensate
from freezing inside the PVC flue pipe in extremely cold
conditions or in long outdoor runs, insulation may be
required on the cut side of the PVC pipe. Use 1/2 inch
thickness closed cell foam insulation such as Armaflex or
45 to
50 feet
Insultube.
3"
3"
3"
3"
3"
3"
3"
3"
45 to
50 feet
Horizontal Vent Termination
3"
3"
NA
In a basement installation, the vent pipe may be run
NA
between the joist spaces. If the vent must go below the
NA
joists, then the pipe must run up into the last joist space to
NA
go through the header. Two 45° elbows should be used
NA
rather than 90's. The horizontal run must not have any sag
NA
that can hold condensate and should pitch up at least 1/4
inch per foot so that condensate will run back to the unit to
drain. Support the horizontal run at least every three feet.
45 to
Allow for some expansion and contraction from tempera-
50 feet
ture fluctuations. The normal direction changes usually
3"
account for this, but if you have a long run followed by a
3"
short offset of less than 40 inches such as going up into the
NA
last joist space, the pipe should be tightly clamped to
NA
prevent flex loading on the fittings. Seal around the pipe on
NA
the outside wall with silicone caulking material.
NA
NA
If the vent is to be run vertically through the roof, it must
NA
extend at least 12 inches above the roof line and shall be
at least 12 inches from any vertical wall. It must terminate
at least three feet above any forced air inlet located within
10 feet, and at least 12 inches from any door, window, or
gravity air inlet into any building. If heavy snow is expected
to remain on the roof, the clearances to vertical walls and
the roof may need to be increased. The vent must be made
8
Figure 5
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