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Installation & Operation Manual
3" S.S. ADAPTER
3" S.S. INTERMEDIATE
(FOR SAF-T VENT ONLY)
Figure 3-11 Near Boiler Stainless Steel Venting Model 286
Stainless steel air intake/vent connections
1. Combustion Air Intake Connector (FIG. 3-11) - Used to
provide combustion air directly to the unit from
outdoors. A fitting is provided on the unit for final
connection. Combustion air piping must be supported
per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2. Vent Connector (FIG. 3-11) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
The Knight boiler uses model specific combustion air intake
and vent piping sizes as detailed in Table 3C below.
Model Air Intake Vent
81 - 211 3 inches 3 inches
286 4 inches 4 inches
Table 3C Air Intake/Vent Piping Sizes
Increasing or decreasing combustion air
or vent piping is not authorized.
NOTICE
Minimum / Maximum allowable combustion
air and vent piping lengths are as follows:
Combustion Air = 12 equivalent feet minimum / 100 equivalent
feet maximum
Vent = 12 equivalent feet minimum / 100 equivalent feet
maximum
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow and 3 feet for each 45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit (CVK3003) = 49 equivalent
feet of piping.
The appliance output rating will reduce by
up to 1.5% for each 25 feet of vent length.
NOTICE
3 General venting (continued)
Table 3B Approved Stainless Steel Terminations and Adapters
Model
ProTech Heat Fab Z Flex
FasNSeal Saf-T Vent Z-Vent
Boiler
Adapter
Flue
Termination
Intake
Air
Termination
Boiler
Adapter
Intermediate
Adapter
Flue
Termination
Intake
Air
Termination
Boiler
Adapter
Flue
Termination
Intake Air
Termination
81 - 211
300715
FSBS3
FSRC3(R.C)
303889 KB80210 9353BUREZ-1*
9392
5300CI
9314TERM 2SVSLA03
2SVSTP03
2SVSRCX03
2SVSTEX0390
286
F303759
FSBS4
FSRC4(R.C.)
FSAIH04
303888
KB285600 9454BUREZ-1*
9492
5400CI
9414TERM 2SVSLA04
2SVSTP04
2SVSRCX04
2SVSTEX0490
* = This adapter must be used in addition to the boiler adapter for Saf-T vent pipe as shown in FIG. 3-11, unless approved vent
other than standard diameter is used. Consult a Heat Fab representative for questions.