ECR Dunkirk PVWB Series, Manual

9

MINIMUM VENT PIPE CLEARANCE
Wood and other combustible materials must not be 
closer than 6” from any surface of single wall metal 
vent pipe. Listed Type B vent pipe or other listed 
venting systems shall be installed in accordance with 
their listing.

REMOVING EXISTING BOILER FROM COMMON 
VENTING SYSTEM
When an existing boiler is removed from a common 
venting system, the common venting system is likely 
to be too large for proper venting of the appliances 
remaining connected to it.
At the time of removal of an existing boiler, the following 
steps shall be followed with each appliance remaining 
connected to the common venting system placed 
in operation, while the other appliances remaining 
connected to the common venting system are not in 
operation.

1. Seal any unused openings in the common venting 

system.

2. Visually inspect the venting system for proper 

size and horizontal pitch and determine there is no 

blockage or restriction, leakage, corrosion and other 

defi ciencies which could cause an unsafe condition.

 3. Insofar as is practical, close all building doors and 

windows and all doors between the space in which 

the appliances remaining connected to the common 

venting system are located and other spaces of the 

building. Turn on clothes dryers and any appliance not 

connected to the common venting system. Turn on 

any exhaust fans, such as range hoods and bathroom 

exhausts, so they will operate at maximum speed. Do 

not operate a summer exhaust fan. Close fi replace 

dampers.

4. Place in operation the appliance being inspected. 

Follow the lighting instructions. Adjust thermostat 

so appliance will operate continuously.

5. Test for spillage at the draft hood relief opening 

after 5 minutes of main burner operation. Use 

the fl ame of a match or candle, or smoke from a 

cigarette, cigar or pipe.

6. After it has been determined that each appliance 

remaining connected to the common venting system 

properly vents when tested as outlined above, return 

doors, windows, exhaust fans, fi replace dampers and 

any other gas-burning appliance to their previous 

conditions of use.

7. Any improper operation of the common venting 

system should be corrected so the installation 

conforms with the National Fuel Gas Code, ANSI 

Z223.1/NFPA 54. When re-sizing any portion of the 

common venting system, the common venting system 

should be re-sized to approach the minimum size as 

determined using the appropriate tables in Chapter 

13 of the National Fuel Gas Code, ANSI Z223.1/

NFPA 54.

Vent connectors serving appliances vented by 

natural draft shall not be connected into any 

portion of mechanical draft systems operating 

under positive pressure.

CHIMNEY AND VENT PIPE CONNECTION