Install Instructions

107750-01 - 9/17

VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued)

8. Installations using PolyPro-ex (Vent Options 18,19,33,34):

WARNING

Asphyxiation Hazard. When using PolyPro ex, observe the following precautions:

• PolyPro ex may be damaged by handling at low temperatures. Do not bend, uncoil, or attempt to install

if it has been stored at a temperature below 42°F without allowing it to warm to a higher temperature

rst.

• Do not bend PolyPro ex more than 45°.

• Instructions below reference the DuraVent PolyPro Flex instruction manual. Not all vent

congurations shown in the DuraVent manual are listed for use with this boiler.

Refer to DuraVent PolyPro ex Instructions for assembly of all ex components including the chimney cap and the adaptor

to rigid PolyPro at the base of the masonry or B vent chimney. In addition, observe the following requirements:

a. Refer to the appropriate Vent option in Tables 7.13b or 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. B vent chimneys can only be used for an air chase (Vent options 18, 19) if the B vent has the minimum size shown in

Table 7.13b and is fully accessible for sealing of all joints and seams.

d. When Vent Option 18 or 19 is used, install a Tee on the base of the B-vent that is the same size as the B- Vent chimney.

Install the PolyPro Lower B–Vent adaptor in the base of this Tee as described in the DuraVent PolyPro Flex instructions.

Connection of the PVC air intake pipe to the side outlet of the tee is made using a cap and a PVC socket x male thread

adaptor (3" or 4", depending on the Vent Option). Cut a clearance hole in the cap for the male threads. Secure the

adaptor to the cap using a 3" or 4" electrical conduit lock nut. Seal all joints with RTV.

G. Assembly of Selkirk Polyue Vent Systems

1. This boiler has been listed for use with the Selkirk Polyue single wall PolyPropylene vent system to be provided by the

installer.

2. Assemble the vent system, starting at the boiler:

a. The vent adaptor has three different inside diameters. The middle inside diameter accepts 4" nominal Polyue

(Figure 7.26). Lubricate the upper gasket in the vent adaptor with mild soapy water and insert the rst piece of 4"

Polyue into the adaptor until it bottoms out. Tighten band clamp on vent adapter to secure vent pipe.

b. If 3" Polyue is to be used for the vent system, reduce the rst piece of 4" Polyue installed in Step (a) to 3" using

Selkirk #4PF-4R3. Otherwise assemble the next piece of 4" Polyue.

c. For each joint, verify that the gasket is evenly seated in the bell (female) end of the pipe. Lubricate this gasket with mild

soapy water. Slide a Pipe Locking Band over the male end of the pipe to be joined as shown in Figure 7.40. Push the

male end of the next section of pipe into the bell until it bottoms out, then back out 1/8—1/4" to provide room for

thermal expansion. Slide pipe locking band over the female end of the connections and tighten both hose clamps.

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 (53 mm/m).