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Proper Vent/Flue And Combustion Air Piping Practices; Termination Locations - Maytag Amana MES9 Series Installation Instructions Manual

Single-stage gas furnace, type fsp category iv direct or non direct vent air furnace
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Proper Vent/Flue and Combustion Air Piping Practices

Adhere to these instructions to ensure safe and proper furnace
performance. The length, diameter, and number of elbows of
the vent/flue pipe and combustion air pipe (when applicable)
affects the performance of the furnace and must be carefully
sized. All piping must be installed in accordance with local
codes and these instructions.
T
,
O AVOID BODILY INJURY
FIRE OR EXPLOSION
MUST BE KEPT AWAY FROM ALL IGNITION SOURCES
,
FLAMES
AND EXCESSIVE HEAT
A
VOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND
.
EYES
PREFERRED
ACCEPTABLE
WARNING
,
SOLVENT CEMENTS
(
.
.,
I
E
SPARKS
)
AS THEY ARE COMBUSTIBLE LIQUIDS
Figure 4
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
Figure 5
,
OPEN
.
/
OR
Some models require the use of 3" pipe. Do not transition
from a 2" to 3" pipe in a horizontal section of pipe as this
may create a water trap.
Piping must be adequately secured and supported to prohibit
sagging, joint separation, and/or detachment from the fur-
nace. Horizontal runs of vent/flue piping must be supported
every three to five feet and must maintain a 1/4 inch per foot
downward slope, back towards the furnace, to properly return
condensate to the furnace's drain system. Allowances should be
made for minor expansion and contraction due to temperature
variations. For this reason, particular care must be taken to
secure piping when a long run is followed by a short offset of
less than 40 inches.
Precautions should be taken to prevent condensate from freez-
ing inside the vent/flue pipe and/or at the vent/flue pipe termi-
nation. All vent/flue piping exposed to freezing temperatures
below 35°F for extended periods of time must be insulated with
1/2" thick closed cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this manual (or
in unheated areas) must be insulated with 1/2" thick closed
cell foam. Inspect piping for leaks prior to installing insulation.

Termination Locations

Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
3' min.
Grade or Highest
Anticipated
Snow Level
Forced Air
Inlet
13
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
Figure 6
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
<10'
12"
12" min.
12" min.
Direct Vent
Vent/Flue Termination
Vent Termination Clearances
Figure 7
4' min.
4'
min.
12"
min.
Non-Direct Vent
Vent/Flue Termination

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