Burnham K2WTC - Page 18

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NOTICE
Do not exceed maximum vent/combustion air system length. Refer to Tables 7.1B, 7.5, 7.13, and 7.21
in this section for maximum vent/combustion air system length.
Use only vent and combustion air terminals and terminal locations shown in Tables 7.1B, 7.5, 7.13
and 7.21.
VII. Venting A. Vent System Design (continued)
4. Vent Side Noise Attenuator - This boiler comes with a vent side noise attenuator. If equivalent vent length is less than 70
equivalent ft., install noise attenuator as described below. Attenuator is not required on size 135 at altitudes above 2000ft.
Refer to Figure 7.1A.
a. To properly install attenuator, insert approximately a 9” length CPVC pipe in vent adaptor.
 b. Fita3”CPVCcouplingonlengthofpipe.Gluecouplingtopipeusingaeldsuppliedcementandprimerthatis
listed for use with materials being joined (CPVC and/or PVC).
c. Insert attenuator in length of pipe. Ensure attenuator tube is pointing down and sits inside 3” CPVC coupling.
d. Install remaining venting as described in this manual. If using one of the polypropylene or stainless steel vent
systems listed described in this manual, use a listed adapter to adapt from CPVC to be the other vent system.
Figure 7.1A: Installation of Vent Side Attenuator
NOTICE
This boiler comes with a vent side noise attenuator. If equivalent vent length is less than 70 equivalent
ft., install vent side noise attenuator as described in this manual. Failure to do so may result in boiler
combustion noise during operation. Attenuator is not required on size 135 at altitudes above 2000ft.