Burnham K2WTC - Page 52

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107774-01 - 9/17
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued)
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adapter.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 M&G/DuraVent rely on gaskets for proper sealing. When these
vent 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 the 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.
• Use locking band clamps at all vent pipe joints.
• Do not use anything other than soapy water to lubricate gaskets.
NOTICE
The venting system must be free to expand and contract and supported in accordance with the installation
instructions included by the original Polypropylene venting component manufacturer, M&G/DuraVent.
Polypropylene pipe sections must be disengaged 1/4 to 5/8 in. (6 mm to 16 mm) per joint to allow for
thermal expansion.
4. Installation of Horizontal Fitting Terminals (Terminal Option A):
a. See Figure 7.36 for proper orientation of twin pipe horizontal terminals. Outer edge of exhaust coupling must be 10” or
less from the wall surface. (Figure 7.9)
b. Remove the gasket from the end of the integral exhaust coupling and insert DuraVent Bird Guard #3PPS-BG in it’s place.
c. Add PVC intake per instructions from Section VII - F.
5. Installation of Vertical Fitting Terminals (Terminal Option H):
a. See Figure 7.37 for the proper orientation of twin pipe vertical terminals.
b. Remove the gasket from the end of the integral exhaust coupling and insert the installer supplied rodent screen in it’s
place.
c. A 180° bend (or two 90° elbows) are installed on the top of the air intake pipe. If two 90° elbows are used, a rodent screen
can be installed between them (Figure 7.37). If a 180° bend is used, a the rodent screen in the open side of the bend,
usingaringmadeofPVCpipe.Ifdesired,theterminationttingscanbeattachedtotheendoftheintakepipeswith
eldsuppliedstainlesssteelscrewssothattheycanbelaterremovedforcleaningandinspection.Ifthisisdone,drilla
clearanceholeinthesettingsandatapholeintheendoftheintakepipestoacceptthesescrews.
d. Useroofashingsandstormcollarstopreventmoisturefromenteringthebuilding.Sealtheroofashingtotheroof
using generally accepted practice for the type of roof on the installation. Apply RTV to seal the storm collars to the vent
and intake pipes.