19
SYSTEM OPERATION
bustion air intake to prevent inadvertent blockage. The tee
or elbows used in the vent/flue termination must be included
when determining the number of elbows in the piping sys-
tem.
12345678
2 7571676360565248
3 126 120 115 110 105 99 94 89
2 3733302622181511
3 107 102 96 91 86 81 75 70
2 100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
2 5045403530252015
3 143 136 129 122 115 108 101 94
2 6055504540353025
3 113 106 99 92 85 78 71 64
2 6055504540353025
3 120 113 106 99 92 85 78 71
2 4540353025201510
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 151 144 137 130 123 116 109 102
*MEC961205DN
3 185 178 171 164 157 150 143 136
2 100 95 90 85 80 75 70 65
3 110 103 96 89 82 75 68 61
2 4540353025201510
3 110 103 96 89 82 75 68 61
2 353025201510 5NA
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 110 103 96 89 82 75 68 61
*CEC960603BN
*CEC960803BN
*CEC961005CN
*MEC960603BN
^
*MEC960803BN
*MEC960804CN
*MEC961004CN
*MEC961005CN
*CEC960403BN
*MVC96/*CVC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Maximum Allowable Length of Vent/Flue Pipe
MODEL
Pipe Size
(4)
(in.)
Number of Elbows
(3) (5)
*MEC960302BN
&
*MEC960402BN
*MEC960303AN
&
*MEC960403AN
*MEC960603AN
^
1) Maximum allowable limits listed on individual lengths for inlet and flue and NOT a combination.
2) Minimum requirement for each vent pipe is five (5) feet in length and one elbow/tee.
3) Tee used in the vent/flue termination must be included when determining the number of elbows in
the piping system.
4) 2 1/2” or 3” diameter pipe can be used in place of 2” diameter pipe.
5) Increased Clearance Configurations using (2) 45 deg. Long Sweep elbows should be consid-
ered equivalent to one 90 deg. elbow.
6) One 90° elbow should be secured to the combustion air intake connection.
12" MINIMUM
VENT/FLUE TEE
OR
90° ELBOW TURNED
DOWN
12" MINIMUM ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
90% Furnace Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
• A vent termination shall not terminate over public walk-
ways or over an area where condensate or vapor
could create a nuisance or hazard or could be detri-
mental to the operation of regulators, relief valves, or
other equipment.
• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
NOTE: In Canada, the B149 Fuel Gas Code takes prece-
dence over the preceding termination restrictions.
12"
12"
NON-DIRECT VENT
VENT/FLUE TERMINATION
NO TERMINATIONS
ABOVE WALKWAY
12"
4'
4'
NON-DIRECT VENT
VENT/FLUE TERMINATION
DIRECT VENT
VENT/FLUE TERMINATION
12"
10'
3"
FORCED AIR
INLET
OTHER THAN
COMBUSTION AIR
TERMINATION INTAKE
GRADE OR HIGHEST
ANTICIPATED
SNOW LEVEL
90% Furnace Vent Termination Clearances
WARNING
T
HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORAT A LOAD.
W
HEN THE
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET,
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD-SUPPLIED
VENT/FLUE PIPING, AS DAMAGE CAN RESULT IN LEAKS CAUSING BODILY
INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES, INCLUDING CARBON
MONOXIDE.
Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam-
eters
Refer to the following tables for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe sys-
tem of a non-direct vent installation. In addition to the vent/
flue pipe, a single 90° elbow must be secured to the com-
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