Fresh Air For Combustion - UTICA BOILERS PEG075EID Installation, Operation & Maintenance Manual

WARNING
!
Air openings to combustion area must not be
obstructed. Follow instructions below, to maintain
adequate combustion air
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
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 jurisdiction.
• 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.
A. Standard Method. See Table 5 for space with natural
gas boiler only. Use equation for multiple appliances
and/or propane.
Room Volume is greater than 50 cubic feet multiplied
by Total Input [Mbh]
B. Known Air Infi ltration Rate. See Table 5 for
space with boiler only. Use equation for multiple
appliances. Do not use an air infi ltration rate air
changes per hour (ACH) greater than 0.60.
Room volume is greater than 21 cubic feet divided by
ACH (air changes per hour) x Total Input [Mbh]
Table 5 - Minimum Room Volume, Indoor Air Only*
Standard
Input Mbh
Method
75 3750
112.5 5625
150 7500
187 9350
225 11250
262.5 13125
299 14950
* Table values based on boiler only. Add volume for any additional appliances.

FRESH AIR FOR COMBUSTION

Known Air Infi ltration Rate Method (Air Changes Per Hour)
0.1 0.2
15750 7875
23625 11813
31500 15750
39270 19635
47250 23625
55125 27563
62790 31395
12
C. Refer to National Fuel Gas Code for opening
requirements between connected indoor spaces.
• All Outdoor Air. Provide permanent opening(s)
communicating directly or by ducts with outdoors.
A. Two Permanent Opening Method. Provide opening
commencing within 12 inches of top and second
opening commencing within 12 inches of bottom of
enclosure.
 Direct communication with outdoors or
communicating through vertical ducts. Provide
minimum free area of 1 in² 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.
B. One Permanent Opening Method. Provide opening
commencing within 12 inches of top of enclosure.
Provide minimum clearance of 1 inch on sides/back
and 6 inches on front of boiler (does not supersede
clearance to combustible materials).
C. Refer to National Fuel Gas Code for additional
requirements for louvers, grilles, screens and air
ducts.
• Combination Indoor and Outdoor Air. Refer to National
Fuel Gas Code for application information.
0.3 0.4
5250 3938
7875 5906
10500 7875
13090 9818
15750 11813
18375 13781
20930 15698
0.5 0.6
3150 2625
4725 3938
6300 5250
7854 6545
9450 7875
11025 9188
12558 10465