Utica Boilers CuB Series 安装指导

Provide combustion air and ventilation air in accordance

with the section “Air for Combustion and Ventilation,” of the 

National Fuel Gas Code, ANSI Z223.1/NFPA 54, or Sections 

8.2, 8.3 or 8.4 of Natural Gas and Propane Installation 

Code, CAN/CSA B149.1, or applicable provisions of local 

building codes.

Provide make-up air where exhaust fans, clothes dryers,

and kitchen ventilation equipment interfere with proper

operation.

National Fuel Gas Code recognizes several methods 

of obtaining adequate ventilation and combustion air. 

Requirements of the authority having jurisdiction may

override these methods.

• Engineered Installations. Must be approved by 

authority having jurisdictions.

• Mechanical Air Supply. Provide minimum of 0.35 

cfm per Mbh for all appliances located within space. 

Additional requirements where exhaust fans installed. 

Interlock each appliance to mechanical air supply 

system to prevent main burner operation when 

mechanical air supply system not operating.

• All Indoor Air. Calculate minimum volume for all 

appliances in space. Use a different method if minimum 

volume not available.
◊ Standard Method. Cannot be used if known air 

infi ltration rate is less than 0.40 air changes per 

hour. See Table 4 for space with boiler only. Use 

equation for multiple appliances.
Volume ≥ 50 ft3 x Total Input [Mbh]

◊ Known Air Infi ltration Rate. See Table 3 for space 

with boiler only. Use equation for multiple appliances. 

Do not use an air infi ltration rate (ACH) greater than 

0.60.                                            
Volume ≥ 15 ft3/ACH x Total Input [Mbh]

◊ Refer to National Fuel Gas Code for opening 

requirements between connection indoor spaces.

• All Outdoor Air. Provide permanent opening(s) 

communicating directly or by ducts with outdoors.
◊ Two Permanent Opening Method. Provide opening 

commencing within 12 inches of top and second 

opening commencing within 12 inches of bottom 

enclosure.

 

 Direct communication with outdoors or 

communicating through vertical ducts. Provide 

minimum free area of 1 in 2 per 4 Mbh of total 

input rating of all appliances in enclosure.

 

 Communicating through horizontal ducts. Provide 

minimum free area of 1 in2 per 2 Mbh of total input 

rating of all appliances in enclosure.

◊ One Permanent Opening Method. Provide opening 

commencing within 12 inches of top of enclosure. 

Provide minimum clearance of 1 inch on sides 

and back and 6 inches on front of boiler (does not 

supersede clearance to combustible materials).

◊ Combination Indoor and Outdoor Air. Refer to 

National Fuel Gas Code for additional requirements 

for louvers, grilles, screens and air ducts.

• Combination Indoor and Outdoor Air. Refer toNational 

Fuel Gas Code for application information. National Gas 

and Propane Installation Code Requires providing air 

supply in accordance with:

• Section 8.2 and 8.3 when combination of applianceshas 

a total input of up to and including 400 Mbh (120kW).

 

 Does not have draft control device.

• Section 8.4 when combination of appliances has total 

input exceeding 400 Mbh (120 kW).

• Refer to Natural Gas and Propane Installation Code 

for specifi c air supply requirements for enclosure or 

structure where boiler is installed, including air supply 

openings and ducts.

150

7500

22,500

11,250

7,500

5,625

4,500

3,750