MODU-FIRE® Forced Draft Gas-Fired Boiler
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The boiler condensate drain line can get as hot as the stack. This may be
up to 400ºF. This line should be insulated to prevent thermal injury or burns.
Do NOT use copper or plastic for the boiler condensate line, as these may
fail and allow exhaust gas to leak into the room.
3.5.3.4 Vent Terminations
The vent shall extend at least three (3) feet above the roof, or at least two (2) feet above the highest part of any
structure within ten (10) feet of the vent. This is illustrated in the following diagram.
Reference: NFPA 54/ANSI Z223.1 National Fuel Gas Code
To prevent the possible re-circulation of flue gases, the vent designer must take into consideration such things as
prevailing winds, eddy zones, building configurations, etc. Harsco Industrial, Patterson-Kelley can not be
responsible for the effects such adverse conditions may have on the operation of the boilers. Dimensions listed
above are minimums and may not be sufficient for conditions at a specific job site. It is important to locate the
exhaust duct in such a way that it does not become blocked due to snow, ice, and/or other natural or man-made
obstructions.
