DuraVent PolyPro User Manual
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LISTING
Listed to ULC S636 
Rated Class IIA, IIB, and IIC vent system
maximum temperature 230°F (110 °C)
maximum positive pressure 15 in-w.c. 
Massachusetts Plumbers Board,
# G1-0811-42
APPLICATION
ANSI Category II and IV gas-burning 
appliances
Appliances specifically tested and listed to 
use M&G DuraVent PolyPro Venting
PERMITS
Check with your local Building Official, Fire 
Official, or other authority having jurisdiction 
regarding permits, restrictions, and 
installation inspections in your area.
GENERAL INSTALLATION NOTES
Read these instructions before beginning. 
You must use only authorized M&G DuraVent 
PolyPro vent parts, or other parts specifically 
authorized in these instructions and/or listed 
by the appliance manufacturer in order to 
maintain a safe, approved system.
•
Do not fill any air space clearance
(Table 1) with insulation.
•
Do not mix parts or try to match with 
other products or use improvised 
solutions. 
•
Do not install damaged or modified 
parts. 
•
Use soapy water to lubricate gaskets.
•
Never use Petroleum base lubricants.
If these directions and those of the appliance 
manufacturer differ, follow the more 
conservative requirements. If you have any 
questions, contact either your dealer or M&G 
DuraVent directly. A venting system must 
not be routed into, through, or within any 
other vent, such as an existing masonry or 
factory-built chimney flue, unless that vent 
or chimney is not being used to vent another 
appliance and is only used as a conduit for 
the gas-vent system. Plastic venting systems 
shall not pass through fire rated separations 
without approved firestopping. 
Refer to the appliance manufacturer's 
instructions for maximum and minimum 
vent lengths permitted with your specific 
appliance model. This information should 
include guidance on the maximum number 
of elbows and related pressure-drops. The 
total vent length from the appliance to 
the termination shall not be greater than 
specified by the appliance manufacturer. 
If specific guidance is not offered by the 
appliance manufacturer as to Equivalent 
Vent Lengths (EVL) for vent components, the 
general guidelines in Table 2 can be used.
CONDENSATE DRAIN (Fig.1)
Refer to the appliance manufacturer’s 
installation instructions for requirements of 
condensate drainage. Ensure proper system 
slope for drainage. (Fig.7)
Table 1
Clearance to Combustibles
VENT PIPE ORIENTATION
Single Wall
Vertical
Horizontal
Up to 190°F
0"
0"
Up to 230°F
0"
¼" (6mm) all around
Concentric
Up to 230°F
0"
0"
The vent system must be compliant in
accordance with local code requirements
and appropriate National Codes: In
the US: NFPA 54 / ANSI Z223.1 National
Fuel Gas Code or the International Fuel
Gas Code. In Canada: CAN/CGA-B149.1
Natural Gas Installation Code or CAN/CGA-
149.2 Propane Installation Code.
IMPORTANT
