Assembly Of Duravent Polypro Vent Systems - Burnham K2WT Residential Installation, Operating And Service Instructions

VII. Venting
F. Assembly of DuraVent PolyPro Vent Systems (continued)
1. This boiler has been listed for use with the DuraVent PolyPro single wall Polypropylene vent system to be
provided by the installer.
WARNING
Asphyxiation Hazard. Follow these instructions and the installation instructions
included by the original Polypropylene venting component manufacturers, M&G/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 conflict arises between M&G/DuraVent instructions and these
instructions, the more restrictive instructions shall govern.
•
Do not mix vent components or joining methods for listed manufacturers.
• Examine all components for possible shipping damage prior to installation.
•
All condensate that forms in the vent must be able to drain back to the boiler.
2. Assemble the vent system, starting at the boiler:
a. The vent adaptor has three different inside diameters. The middle inside diameter accepts 3" nominal PolyPro
(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 tightened. Lubricate the gaskets in the vent adaptor with soapy water and insert the
first piece of 3" PolyPro into the adaptor until it bottoms out. Tighten locking band clamp to secure vent pipe.
b. If 2" PolyPro is to be used for the vent system, reduce the first piece of 3" PolyPro installed in Step (a) to 2"
using DuraVent # 3PPS-R2. Otherwise assemble the next piece of 3" PolyPro.
c. For each joint, verify that the gasket is evenly seated in the bell (female) end of the pipe. Lubricate this gasket
with water. Slide a locking band over the male end of the pipe to be joined as shown in Figure 7.35. Push the
male end of the next section of pipe into the bell until it bottoms out, then back out 1/4-5/8" to provide room
for thermal expansion. Push barb on locking band over the bell end of the first section of pipe as shown in
Figure 7.35.
d. Assemble the rest of the vent system per the manufacturer's installation instructions, being sure to pitch
horizontal sections back towards the boiler 5/8" per ft.
e. Support each horizontal pipe section with a minimum of one wall strap each and at intervals not exceeding
4ft.
50
F. Assembly of DuraVent PolyPro Vent Systems
Figure 7.35: PolyPro Locking Band Installation
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