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INSTALLATION
1. Use inside wall end plate as a template to mark hole
location. Cut hole 1 inch larger than marked hole to
facilitate easy installation.
2. Mount furnished 18" x 18" stainless steel plate
on the exterior side of the wall with appropriate type
mounting screws. Install vent hood through opening
from outside. Fasten the vent hood to the stainless
steel plate with appropriate type mounting screws.
Caulk as necessary.
3. Fasten wall end plate to the inside wall with
appropriate type mounting screws.
INTAKE AIR
1. Intake air is required to support combustion. It must
enter the same side of building as the exhaust vent
in order to balance wind pressure against the flow of
gases.
2. The bottom of the intake duct must be at least 1'
above grade level.
3. The intake duct and exhaust vent must be not less
than 4' apart unless intake is at least 1' below the level
of exhaust, in which case the intake may be at a radius
of 2' or more from exhaust.
4. Provide a 4" wall opening and mount 4" intake duct
on a flat surface on exterior of wall in the same manner
as the exhaust terminal.
5. To supply intake air to the burner:
A. When a Beckett Model AFG oil burner is used,
run an air duct of 4" smoke pipe (not supplied) from
wall inlet directly to burner intake boot with vacuum
relief (draft regulator) installed in duct. Use a 4"
wrap-around coupling as provided to connect duct
to intake boot.
B. When a Beckett Model SMG oil burner or a
gas burner is used, run intake air duct (without
vacuum relief) from wall inlet down to an open end
approximately 1' from boiler room floor.
C. When a vacuum relief is not used, note that
exhaust fans in use might create a vacuum within
the building which can cause improper combustion.
Consult factory for assistance as required.
D. See Figure #4 for typical installation with a
Beckett Model AFG post purge oil burner.
EXHAUST FLUE PIPE
The exhaust flue pipe from the boiler must be 6' or less
in length in order to minimize condensation. Plan flue
pipe configuration to ensure easy disassembly for
cleaning of boiler interior.
1. Using silicone rubber, permanently cement a stub of
flue pipe 6" to 12" in length to the boiler flue collector. For
ease in later disassembly, use a wrap-around coupling
as provided to connect the stub to the next section of
flue pipe. Connect the remainder of flue pipe in normal
fashion.
2. Run flue pipe as directly as possible with a minimum
number of elbows. Two 45° elbows will cause less
resistance than one 90° elbow.
3. Particular attention should be paid to any point where
the flue pipe passes through a wall or ceiling. Such
penetrations should always be made in accordance
with existing code requirements.
4. At reduced flue pipe sizes, do not use more than two
90° elbows or four 45° elbows, and do not reduce pipe
to less than:
Firing Rate
less than 1.00 gph
more than 1.00 gph
5. Support flue pipe rigidly with substantial pipe hangers
plus three sheet metal screws at each joint.
6. Seal pipe joints carefully with minimum 400°F RTV
silicone sealant or its equal so that no leakage can be
detected by the movement of smoke or a small flame
held near the joints with burner in operation.
IMPORTANT: Advise owner keep air intake free of
obstruction, both indoors and outdoors. Ventilating
and combustion air must enter boiler room and
burner without restriction.
10
Min. Pipe Diameter
4"
6"
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