Ermination Ocations; Practices - Intertek MVM97 Series Installation Instructions Manual

P V /F C
ROPER ENT LUE AND
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.
Piping must be adequately secured and supported to prohibit sagging, joint separation,
and/or detachment from the furnace. Horizontal runs of vent/flue and combustion air
piping must be properly supported. PVC pipe supports must be no more than 5'
apart. For ABS pipe, supports must be no more than 3' apart. Horizontal pipe runs
must maintain a 1/4 inch per foot downward slope, back towards the furnace, to
properly return condensate to the furnace's drain system.
Precautions should be taken to prevent condensate from freezing inside the vent/flue
pipe and/or at the vent/flue pipe termination. All vent/flue piping exposed to tem-
peratures 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 termina-
tions 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.
T L
ERMINATION OCATIONS
NOTE: Refer to Location Requirements and Considerations for combustion air
contaminant restrictions.
The following bullets and diagram describe the restrictions concerning the appropriate
location of vent/flue pipe and combustion air intake pipe (when applicable) termina-
tions. Refer to Non-Direct Vent (Single Pipe) Piping and Direct Vent (Dual Pipe) Piping
located in this section for specific details on termination construction.
• All terminations (flue and/or intake) must be located at least 12 inches above
ground level or the anticipated snow level.
• Vent terminations (non-direct and direct vent) must terminate at
least 3 feet above any forced air inlet located within 10 feet.
NOTE: This provision does not apply to the combustion air intake
termination of a direct vent application.
• The vent termination of a direct vent application must terminate
at least 12 inches from any opening through which flue gases may
enter a building (door, window, or gravity air inlet).
• The vent termination running vertically through a roof must
terminate at least 12 inches above the roof line (or the anticipated
snow level) and be at least 12 inches from any vertical wall
(including any anticipated snow build up).
• A vent termination 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 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 current edition of CAN/CSA B149.1 takes precedence over the preceding termination restriction.
A P P
OMBUSTION IR IPING RACTICES
PREFERRED
Figure 6
ACCEPTABLE
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
Figure 7
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES
Figure 8
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