3
General venting
Installation & Operation Manual
16
Model
2" Max Vent/
Air
3" Max Vent/
Air
4" Max Vent/
Air
55
*80 feet
100 feet
N/A
85
*50 feet
100 feet
N/A
110
*40 feet
100 feet
N/A
155
N/A
100 feet
N/A
199
N/A
100 feet
N/A
285
N/A
*50 feet
100 feet
399
N/A
N/A
100 feet
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3. The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings. For concentric vent installations, the inner
vent tube must be replaced with field supplied certified vent
material to comply with this requirement.
4. The 2" and 3" Concentric Vent Kits available from
Lochinvar (see Section 4 –
Sidewall Termination – Optional
Concentric
Vent
) and the 2" and 3" Concentric Vent Kits
available from IPEX are approved for use on the Knight
wall mount boiler. Both kits are listed to the ULC-S636
standard for use in Canada.
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° (2)
45° (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
Model Kit Number
Equivalent Vent
Length
55 - 110
CVK3008
3 feet
155 - 199
CVK3003
3 feet
285 - 399
CVK3007
3 feet
Table 3B Concentric Vent Kit Equivalent Vent Lengths
Sizing
The Knight boiler uses model specific combustion air intake and
vent piping sizes as detailed in Table 3A below.
Table 3A Air Intake/Vent Piping Sizes
Increasing or decreasing combustion air or
vent piping sizes is not authorized.
NOTICE
For Models 55, 85, and 110 using 2"
venting and Model 285 using 3" venting,
the first seven (7) equivalent feet of vent
must be CPVC (field supplied). This
includes any transition piece used to
increase or decrease the vent diameter.
*
WARNING
Note:
The minimum combustion air and vent piping
length is 12 equivalent feet.
