P-K SONIC
TM
Gas Fired Boiler
T
T
T
Technical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
US Minimum Area of Ventilation Openings per Boiler (Sq In)
SONIC
TM
Boiler
MODEL
AIR SOURCE
INDOOR AIR SUPPLY
OUTDOOR AIR SUPPLY
SAME
FLOOR
DIFF
FLOORS
ONE
OPENING
TWO OPENINGS
DIRECT
VERT
DUCT
HORIZ
DUCT
SC-1500
1500
3000
500
375
375
750
SC-2000
2000
4000
667
500
500
1000
SC-3000
3000
6000
1000
750
750
1500
SC-4000
4000
8000
1334
1000
1000
2000
3.3.1.3 Canadian Considerations
Air inlet requirements for the Canada States are established by CAN/CSA B149.1.
NOTE
1.
The free area of a combustion air supply opening is calculated by deducting the
blockage area of any fixed louvers, grilles or screens from the total area of the
opening.
2. Screens shall be not smaller than ¼ inch.
3. Motorized louvers shall be interlocked with the appliance so that they are proven
open prior to main burner ignition and operation.
A. A. Ventilation of the space occupied by fuel burning appliance(s) or equipment shall be supplied by a
ventilation opening at the highest practicable point communicating with the outdoors. The total cross
sectional area of the ventilation opening must be either 10% of the net free area required for
combustion air or 10 sq. in. (6500 mm
2
), whichever is greater.
B.
Use the following opening calculation for
P-K SONIC
TM
boilers:
When combustion air is supplied for a forced draft burner by natural airflow from the outdoors and
there is no draft regulator or draft hood in the same space, there shall be a permanent opening with a
cross sectional area not less than 1 sq. in/30,000 Btu/Hr (70 mm
2
/kW) of the total rated input to the
burner(s). This opening must not interfere with the ventilation air opening defined in paragraph A.
C. Use the following opening calculation for
P-K THERMIFIC®
boilers or other natural draft or fan-assist
appliances
:
When combustion air is supplied for natural or fan-assisted burners by natural airflow from the
outdoors, there shall be a permanent opening with a cross sectional area not less than 1 sq. in/7000
Btu/Hr (321 mm
2
/kW) up to and including 1,000,000 Btu/Hr plus 1 sq. in./14,000 Btu/Hr (155 mm
2
/kW)
in excess
of
1,000,000 Btu/Hr. This opening must be either located at or ducted to a point not more
than 18 in. (450 mm) or less than 6 in. (150 mm) above floor level. This opening is in addition to the
ventilation air opening defined in paragraph A.
D. When combustion air is supplied by natural airflow into a space containing both types of appliance
described in paragraphs B and C, the cross sectional area of the opening shall not be less than the
sum of the cross sectional areas for all appliances in the space as calculated by the applicable
method. This opening is in addition to the ventilation air opening defined in paragraph A.
E. When a duct is used to meet the requirement for combustion air supply, as described in paragraphs A
through D, above, the opening of the duct shall be located so there is no possibility of cold air
affecting steam or water piping, electrical equipment or mechanical equipment.
