Burnham K2WTC - Assembly of Stainless Steel Vent Systems

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1. This boiler has been approved for use with Duravent FasNSeal Flex Stainless Steel vent systems to be provided by the
installer.
WARNING
Asphyxiation Hazard. Follow these instructions and the installation instructions included by the original
stainless steel venting component manufacturer, DuraVent. Failure to do so could cause products of
combustion to enter the building, resulting in severe property damage, personal injury or death. Where a
conict arises between DuraVent instructions and these instructions, the more restrictive instructions shall
govern.
Do not mix vent components from listed manufacturers.
Examine all components from listed manufacturers.
All condensate that forms in the vent must be able to drain back to the boiler.
2. The vent adaptor has three different inside diameters. The smaller, lower diameter accepts 3” Stainless steel (Figure 7.27).
A locking band clamp in the adaptor prevents the vent pipe from coming out of the adaptor once it is installed and tight-
ened.Lubricatetheuppergasketsintheventadaptorwithwaterandinserttherstpieceof3”stainlessintotheadaptor
until it bottoms out. Tighten locking band clamp to secure vent pipe.
3. Installation of Air Intake System - Start assembly of the PVC air intake system at the boiler. Assembly of the air intake
system is done in the same manner as the vent system except as follows:
a. Drill a 7/32” clearance hole into the front side of the air intake adaptor.InserttherstpieceofPVCairintake 
pipe into the air intake connection and drill a 1/8” tap hole into the PVC which lines up with the 7/32” clearance
hole and secure them together with a #10 x 1” sheet metal screw. Seal the joint between the intake pipe and the
adaptor with RTV.
b. All intake piping may be PVC.
c. There is a 0” minimum clearance between the air intake piping and all types of construction.
d. To the extent possible, pitch horizontal air intake piping towards the outside.
WARNING
Asphyxiation Hazard. Vent systems made by Duravent rely on gaskets for proper sealing. When these vents
systems are used, take the following precautions:
• Make sure that gasket is in position and undamaged in the female end of the pipe
• Make sure that both male and female pipes are free of damage prior to assembly.
• Only cut vent pipe as permitted by the vent manufacturer in accordance with their instructions.
When pipe is cut, the cut end must be square and carefully de-burred prior to assembly.
4. Installation using DuraVent FasNSeal Flex (Vent Option 18)
 Refertomanufacturer’sinstructionsforassemblyofallexcomponentsincludingthechimneycapandadaptortorigid
pipe at base of masonry or B Vent Chimney (DuraVent FasNSeal Flex only permitted in masonry type chimneys). In
addition, observe the following requirements:
a. Refer to the appropriate Vent option in table 7.21foralistoftheprincipleexcomponentsrequired.Rigid 
vent pipe by the same manufacturer will also be required for the run from the boiler to the base of chimney.
b. Masonry chimneys cannot be used for an air chase.
c. Flexible stainless steel vent shall be installed in an UNUSED masonry chimney/chase and supplying combustion air
throughaseparatewallorroofcombustionairterminal.Theunusedchimneyuemustbestructurallysoundandingood
repair. A chimney is considered UNUSED when it is not being used for any appliance venting. If chimney is a multiple
uetypewhereoneofthemultipleuesisbeingusedforanapplianceventing,theexiblestainlessventinstallation
ispermittedthroughanadjacent,unusedueprovidingalocalauthorityhavingjurisdictionapprovessuchinstallation.
(Figure 7.25b)
VII. Venting I. Assembly of Stainless Steel Vent Systems
I. Assembly of Stainless Steel Vent Systems