ECR UTICA BOILERS UB95M-200, Installation, Operation & Maintenance Manual

viii - combustion air and vent pipe

should be taken to prevent building materials at the vent 

from being damaged by exhaust of flue gas.

The venting system shall terminate at least 3’ above any forced 

3. 

air inlet (except  boiler’s combustion air inlet) within 10’. The 

venting system shall terminate at least 12” from any  air open-

ing into any building. The bottom of the vent shall be located at 

least 12” above grade. The vent terminal shall not be installed 

closer than 3’ from the inside corner of an “L” shaped structure. 

Termination of the vent should be kept at least 3’ away from 

vegetation. The venting system shall terminate at least 4’ hori-

zontally from, and in no case above or below, electric meters, 

gas meters, regulators, and relief equipment, or under a deck or 

porch.
Through the wall vents for Category II and IV appliances and 

4. 

non categorized condensing appliances shall not terminate over 

public walkways or over an area where condensate or vapor 

could create a nuisance or hazard or could be detrimental to the 

operation of regulators, relief vales, or other equipment. Where 

local experience indicates that condensate is a problem with 

Category I and III appliances, this provision shall also apply. If 

multiple terminations are used, there must be a minimum of 

12” between the exhaust of one termination and the air intake 

of the next termination. See Figures 1-3 for illustrations.

installation

NOTICE

IMPORTANT: When transitioning from CPVC to PVC 

it is recommended to use Weld-On CPVC 724 or other 

cement approved for CPVC to PVC. In Canada ULC S636 

approved cement must be used.

Attach combustion air intake piping to supplied 2” PVC Intake 

1. 

Connector. Attach vent piping to furnished 2” CPVC vent pipe. 

Use a 2” x 3” adapter in both air inlet and exhaust.

NOTICE

NOTE: All pipe joints are to be water tight.

Working from the boiler to the outside, cut pipe to required 

2. 

length(s).
Deburr inside and outside of pipe, and remove all shavings 

3. 

from pipe. 
Chamfer outside edge of pipe for better distribution of primer 

4. 

and cement.
Clean and dry all surfaces to be joined.

5. 

Check dry fit of pipe and mark insertion depth on pipe.

6. 

FIELD INSTALL 2” BY 3”

 TRANSITION IN THE 

VERTICAL POSITION 

ONLY 

(2 REQ’D, NOT FUR-

NISHED)

2” (50.8MM) COMBUSTION 

AIR INTAKE PIPING 

(FURNISHED)

3”  INTAKE AND EX-

HAUST 

TERMINATIONS

2” (50.8MM) CPVC

 VENT PIPING

 (FURNISHED &

 REQUIRED)

Reduce the maximum vent length by 5’ per each 90° elbow.

Exhaust air piping to be pitched back to boiler at minimum ¼” 

1. 

per foot from vent terminals so that all moisture in vent piping 

drains to boiler. Pipes must be pitched continuously with no 

sags or low spots where moisture can accumulate and block the 

flow of flue gas. Combustion air and vent pipes must be airtight 

and watertight.

Consideration for the following should be used when deter-

2. 

mining an appropriate location for termination of combustion 

air and vent piping:

Comply with all clearances required.

•

Termination should be positioned where vent vapors will 

•

not damage plants/shrubs or air conditioning equipment.

Termination should be positioned so that it will not be ef-

•

fected by wind eddy, air born leaves, snow, or recirculated 

flue gases.

Termination should be positioned where it will not be 

•

subjected to potential damage by foreign objects, such as 

stones, balls, etc.

Termination should be positioned where vent vapors are 

•

not objectionable.

Put vent on a wall away from the prevailing winter wind. 

•

Locate or guard the vent to prevent accidental contact with 

people or pets.

Terminate the vent above normal snow line. Avoid 

•

locations where snow may drift and block the vent. Ice 

or snow may cause the boiler to shut down if the vent 

becomes obstructed.

Under certain conditions, flue gas will condense, form-

•

ing moisture, and may be corrosive. In such cases, steps 

figure 8 - combustion air & vent piping

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