Utica Boilers CuB Series 安装指导

Horizontal (Category III) venting systems installation 

shall conform to the requirements of the authority having 

jurisdiction or, in the absence of such requirements, to 

the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/

or Natural Gas and Propane Installation Code, CAN/CSA 

B149.1

Boilers may be vented horizontally.

 

Vent pipe is pitched 

down from boiler to vent termination. Do not connect 

other appliances to this vent. 

Vent Pipe Material UL Listed - AL294C Stainless Steel 

vent pipe and fi ttings.

Clearance to Combustible Materials: For stainless steel 

vent pipe maintain 6” minimum air space clearance to 

combustible materials.

Vent Pipe Size: 3” vent pipe connected directly to the 

outlet of the induced draft blower.

Vent Pipe Length:
A.  For stainless steel vent pipe, the maximum 

horizontal vent length is 65 equivalent feet. 

B.  Minimum horizontal vent length is 5 equivalent 

feet.

C.  For  3”  90° elbows = 5 equivalent feet of vent 

length.

Vent Termination Fitting: For all vent pipe materials, 

you may use either:
A.  90° elbow pointing down, fi tted with a minimum 

1/4” mesh screen to keep out rodents and birds. 

The elbow shall be of the same material and size 

as vent pipe. The elbow exit should be at least 6” 

away from exterior wall. 

-or-

B.  Concentric side wall vent hood. 

Vent Pipe Termination Location  :
A.  When venting through combustible walls, 

combustible clearances must be considered. ECR 

vent termination, 5612601, is a certifi ed direct vent 

termination (for Catagory III venting)  providing 

both the outside vent termination and a double 

wall pipe for passing through a combustible 

wall up to 10” thick. Vent terminations by other 

manufacturers may also be used as long as they 

are certifi ed for catagory III venting.

B.  If the 90° elbow is the termination fi tting of choice, 

then the single wall pipe will be passing through the 

side wall. For combustible walls, a UL listed thimble 

shall be used where the single wall pipe passes 

through the wall.

C.  For single wall pipe through non-combustible 

walls, the hole through the wall need only be large 

enough to maintain the pitch of the vent pipe, and 

provide proper sealing. A thimble is not required for 

single wall pipe passing through non-combustible 

walls.

D.  The venting system shall terminate at least 3 feet 

0.9m) above any forced air inlet located within 

10 feet (3m). The venting system shall terminate 

at least 4 feet (1.2m) below, 4 feet (1.2m) 

horizontally from, or 1 foot (300 mm) above any 

door, window, or gravity air inlet into any building. 

The bottom of the vent shall be located at least 12 

inches (300mm) above grade. Termination of the 

vent shall be not less than 7 feet (2.13m) above 

adjacent public walkway. The vent terminal shall 

not be installed closer than 3 feet (0.9m) from the 

inside corner of an L shaped structure. Termination 

of the vent should be kept at least 3 feet (0.9m) 

away from vegetation. The venting system shall 

terminate at least 4 feet horizontally from, and in 

no case above or below, unless a 4 foot horizontal 

distance is maintained, from electric meters, gas 

meters, regulators, and relief equipment. 

• The venting system shall terminate at least 4 feet 

below any eave, soffi t, or roof overhang.

• The venting system shall not terminate 

underneath any deck, patio, or similar structure.

• 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, fl ue gas will condense, 

forming moisture. In such cases, steps should be 

taken to prevent building materials at the vent 

terminal from being damaged by exhaust of fl ue 

gas.

United States - Terminate vent system at least 

4 feet (1.22m) horizontally from, and in no case 

above or below, unless a 4 feet (1.22m) horizontal 

distance is maintained, from electric meters, gas 

meters, regulators and relief equipment.

Canada - Terminate vent system at least 6 feet 

(1.83 m) horizontally from, and in no case above 

or below, unless a 6 feet (1.83m) horizontal 

distance is maintained, from electric meters, gas 

meters, regulators and relief equipment.

Joining and Sealing the Vent Pipe: The vent pipe needs 

to be both watertight and gas tight. Seal all joints and 

seams following vent pipe manufacture’s installation 

instructions.

Support Spacing: Do not restrict thermal expansion 

movement of the vent. The vent pipe must expand 

and contract freely with temperature change. Each run 

of vent piping shall be supported following vent pipe 

manufacture’s instructions.