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// CODE SNIPPET

909.6 Pressurization Method

NYC Building Code 2014 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.6 Pressurization Method
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The primary mechanical means of controlling smoke shall be by pressure differences across smoke barriers. Maintenance of a tenable environment is not required in the smoke control zone of fire origin.

909.6.1 Minimum Pressure Difference

The minimum pressure difference across a smoke barrier shall be 0.05-inch water gage (0.0 124 kPa) in fully sprinklered buildings. In buildings permitted to be other than fully sprinklered, the smoke control system shall be designed to achieve pressure differences at least two times the maximum calculated pressure difference produced by the design fire, but in no case less than the values indicated in Table 909.6.1:
TABLE 909.6.1
MINIMUM PRESSURE DIFFERENCES ACROSS SMOKE BARRIERS
CEILING HEIGHT MINIMUM DESIGN
PRESSURE DIFFERENCE
Less than 15 feet (4572 mm) 0.10-inch water gage (0.0259 kPa)
Equal to or greater than 15 feet
(4572 mm), but less than 21 feet (6401 mm)
0.14-inch water gage (0.0349 kPa)
Equal to or greater than 21 feet
(6401 mm)
0.18-inch water gage (0.0448 kPa)

909.6.2 Maximum Pressure Difference

The maximum air pressure difference across a smoke barrier shall be determined by required door-opening or closing forces. The actual force required to open exit doors when the system is in the smoke control mode shall be in accordance with Section 1008.1.3. Opening and closing forces for other doors shall be determined by standard engineering methods for the resolution of forces and reactions. The calculated force to set aside-hinged, swinging door in motion shall be determined by:



where:

A = Door area, square feet (m2).
d = Distance from door handle to latch edge of door, feet (m).
F = Total door opening force, pounds (N).
Fdc = Force required to overcome closing device, pounds (N).
K = Coefficient 5.2 (1.0).
W = Door width, feet (m).
ΔP = Design pressure difference, inches of water (Pa).

Related Code Sections


513.6 Exhaust Systems, Pressurization Method
The primary mechanical means of controlling smoke shall be by pressure differences across smoke barriers. Maintenance of a tenable environment ...
NYC Mechanical Code 2008 > 5 Exhaust Systems > 513 Smoke Control Systems > 513.6 Pressurization Method
513.6 Exhaust Systems, Pressurization Method
The primary mechanical means of controlling smoke shall be by pressure differences across smoke barriers. Maintenance of a tenable environment ...
NYC Mechanical Code 2014 > 5 Exhaust Systems > 513 Smoke Control Systems > 513.6 Pressurization Method
909.6 Fire Protection Systems, Pressurization Method
The primary mechanical means of controlling smoke shall be by pressure differences across smoke barriers. Maintenance of a tenable environment ...
NYC Building Code 2008 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.6 Pressurization Method
909.6 Fire Protection Systems, Pressurization Method
The primary mechanical means of controlling smoke shall be by pressure differences across smoke barriers. Maintenance of a tenable environment ...
NYC Building Code 2014 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.6 Pressurization Method
909.6.1 Fire Protection Systems, Minimum Pressure Difference
The minimum pressure difference across a smoke barrier shall be 0.05-inch water gage (0.0 124 kPa) in fully sprinklered buildings. In buildings ...
NYC Building Code 2014 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.6 Pressurization Method > 909.6.1 Minimum Pressure Difference
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