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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 first 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.

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 fittings can be attached

to the end of the intake pipes with field 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 fittings and a tap hole in the end of the

intake pipes to accept these screws.

d. Use roof flashings and storm collars to prevent moisture from entering the building. Seal the roof flashing 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.

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.