INSTALLATION AND OPERATION INSTRUCTIONS
1-16
SFC BOILER / WATER HEATERS - SFC 199
Intake Pipe Sizing
For 3" Flexible PPs, you can use up to 35 actual lineal feet in a nominally vertical
orientation (>45°). The equivalent length of 3" Flexible PPs must be calculated
using a multiple of 1.4:1, e.g. 35' x 1.4 = 49' equivalent. The balance of the
venting allowance is still available for use with rigid PPs piping material.
2" Flexible PPs is not allowed.
INTAKE PIPE SIZE/FITTINGS MAXIMUM EQUIVALENT LENGTH
Schedule 40 PVC, ABS, CPVC or PPs – Allowances are for each side separately.
2" 35'
3" 120'
2" or 3" 90' Long Sweep Vent Elbow Allow 5 equivalent feet
2" or 3" 90' Short Sweep Vent Elbow Allow 8 equivalent feet
2" or 3" 45' Vent Elbow Allow 3 equivalent feet
PPS
PPs 87-90' Elbow Allow 8 equivalent feet
Flex PPS – Factor = 1.4
3" PPs Flex 35 actual feet
Table 4: Maximum intake piping length.
For intake air, you can use Schedule 40 PVC, CPVC, ABS or PPs piping of any
type. Use the same diameter as vent piping.
Insert combustion air piping directly into the 3" female plastic tting on the top of
the unit, and run it horizontally or vertically to the outdoors. We recommend using
a bird screen of 1/4" stainless steel or plastic mesh (eg. IPEX System 636 drain
grate for CPVC systems) to guard against foreign objects.
Care must be taken to ensure adequate separation is maintained between the
air intake inlet and the vent terminal. Refer to the vent terminal conguration
drawings in the “Vent Termination” section above.
Support should be provided for intake piping, particularly for horizontal runs
(follow local code).
1.4.8 “Indoor Air” 1.4.8 “Indoor Air” Combustion Air
Intake
Indoor combustion air is not approved for use with the SFC series units.
1.4.9 Closet Installations
For installations in a conned space (such as a closet), ventilation openings may
be needed through a door or wall to prevent build-up of excessive heat from
inside the space.
The unit must not be exposed to surrounding conditions above 122°F (50°C) or
below 32°F (0°C).
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