Common Air Intake And Exhaust Venting Of; Intake Duct Sizing - FULTON FHE-250 Installation, Operation & Maintenance Manual

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2.12.1
COMMON AIR INTAkE AND ExHAUST VENTING OF MULTIPLE BOILERS
Combining multiple FHE-250 boilers into a common flue or duct for combustion air supply,
exhaust, or both is only permitted on a case by case basis and must be accomplished with an
engineered solution. Please contact Fulton for details/designs.
Adhere to the following:
1. There is an integral combustion air supply damper within the unit, complete with a magnetic
switch that is fully integrated into the standard boiler controls, to prevent flue gases from
entering the plantroom.
2. FHE-250 boilers should not be common vented with other types of equipment.
Fulton cannot assume responsibility for an air intake or exhaust
arrangement where FHE-250 boilers are common vented with any other type of equipment.
2.12.2

INTAkE DUCT SIzING

1. Air intake ducting must be sized in conjunction with the exhaust venting to provide no greater
than a 2 mbar (200 Pa) combined pressure drop. Refer to Section 2.14.1 - Flue System
Design for further details and guidance on this issue.
2. Each FHE-250 module with internal intake ducting incorporates a coarse air filter. The
installation of a recognised termination screen is required on all combined air intakes for
multiple boiler modules.
3. Air intake ducts and fittings shall be galvanised steel or Schedule 30 PVC pipe.
Note: where these boilers are to be room-sealed,the internal air inlet ductwork and fittings and external connector
for ducted connections are all in galvanised steel.
4. If using PVC, all intake PVC piping must be assembled using suitable cement. This will
ensure that the intake is airtight and will not allow contaminants from the boiler room into the
boiler.
5. Air intake terminations must be suitably weatherproofed to prevent ingress of moisture into
the system.
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FHE-250 MANUAL 09 2014 ISSUE 2