Ventilation & Combustion Air - ECR International PENNCO 15B III Series Installation, Operation & Maintenance Manual

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.
о Standard Method. Cannot be used if known air
infiltration rate is less than 0.40 air changes per
hour. See Table 3 for space with boiler only. Use
equation for multiple appliances.
Volume ≥ 50 ft
о Known Air Infiltration Rate. See Table 3 for
space with boiler only. Use equation for multiple
appliances. Do not use an air infiltration rate
(ACH) greater than 0.60.
Volume ≥ 21 ft
о Refer to National Fuel Gas Code for opening
requirements between connection indoor spaces.
Table 3 - Minimum Room Volume, Indoor Air Only*
Standard
Input Mbh
Method
45 2250
70 3500
96 4800
120 6000
145 7250
170 8500
195 9750
245 12250
295 14750
* Table values based on boiler only. Add volume for any additional appliances.
4 - VENTILATION & COMBUSTION AIR
x Total Input [Mbh]
3
/ACH x Total Input [Mbh]
3
Known Air Infiltration Rate Method (Air Changes Per Hour)
0.1
9450
14700
20160
25200
30450
35700
40950
51450
61950
• All Outdoor Air. Provide permanent opening(s)
communicating directly or by ducts with outdoors.
о Two Permanent Opening Method. Provide opening
commencing within 12 inches of top and second
opening commencing within 12 inches of bottom
enclosure.
ƒ Direct communication with outdoors or
ƒ Communicating through horizontal ducts.
о 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).
о 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 to
National 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 appliances
has a total input of up to and including 400 Mbh (120
kW).
• Section 8.4 when combination of appliances has total
input exceeding 400 Mbh (120 kW).
• Refer to Natural Gas and Propane Installation Code
for specific air supply requirements for enclosure
or structure where boiler is installed, including air
supply openings and ducts.
0.2 0.3
4725 3150
7350 4900
10080 6720
12600 8400
15225 10150
17850 11900
20475 13650
25725 17150
30975 20650
7
communicating through vertical ducts. Provide
minimum free area of 1 in
input rating of all appliances in enclosure.
Provide minimum free area of 1 in
Mbh of total input rating of all appliances in
enclosure.
0.4 0.5
2363 1890
3675 2940
5040 4032
6300 5040
7613 6090
8925 7140
10238 8190
12863 10290
15488 12390
per 4 Mbh of total
2
per 2
2
0.6
1575
2450
3360
4200
5075
5950
6825
8575
10325