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Figure 3b: Vents - Faults and Suggestions
WARNING
Venting Instructions are recommendations only. Consult a venting expert on the design of a specic
vent system for your application. The ASHRAE Venting Guide and The National Fuel Gas Code, NFPA
54 should be considered in all venting systems.
Conventional vent material may not be suitable for the application. Flue gases can leak carbon
monoxide from the joints on these materials and can result in severe personal injury or death.
Installations having long horizontal runs or an excessive amount of tees or elbows will restrict the ow
of combustion gases and can result in condensation, ue gas leakage of carbon monoxide, resulting in
severe personal injury or death.
Typical Vents that are used on Forced Draft Boilers, on Low Silhouette Buildings
- Area must be the same as or greater than the boiler breeching (Smoke Outlet). A barometric damper
may be required on installations with a high draft condition.
1. If improper vent is suspected, remove pipe at breeching and operate boiler. This will determine if excessive
down draft, blocked or restricted ue, etc. is causing the problem.
2.
If using type shown in A above, be sure cap is raised sufciently above main pipe to allow ue gases to vent
unimpeded.
3. A popular type cap is shown in B.
4. The tee is frequently used as shown in C.
5. D and E should not be used due to possible uctuations in back pressure.
WARNING
Single wall Type C vent material is not approved for MPC boiler venting. When an MPC gas red boiler
is connected to a venting system that is designed so that it will operate under a negative pressure,
manufactured vent systems, designed and approved for positive pressure application per UL1738,
must be used (for example, Van-Packer Model CS, Protech Model FasNSeal / FasNSeal W2, Heatfab
Saf-T-Vent or equivalent).
When an MPC oil red or combination gas/oil red boiler is connected to a venting system that is
designed so that it will operate under a positive pressure, manufactured vent systems, designed and
approved for positive pressure application, must be used (for example, Selkirk Metalbestos Model PS/
IPS, Van-Packer Model ES or equivalent).