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// CODE SNIPPET

909.7 Air Flow Design Method

NYC Building Code 2014 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.7 Air Flow Design Method
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When approved by the department, smoke migration through openings fixed in a permanently open position, which are located between smoke control zones by the use of the airflow method, shall be permitted. The design air flow shall be in accordance with this section. Air flow shall be directed to limit smoke migration from the fire zone. The geometry of openings shall be considered to prevent flow reversal from turbulent effects.

909.7.1 Velocity

The minimum average velocity through a fixed opening shall not be less than:




where:

h = Height of opening, feet (m).
T f = Temperature of smoke, °F (°K).
To = Temperature of ambient air, °F (°K).
v = Air velocity, feet per minute (m/minute).

909.7.2 Prohibited Conditions

This method shall not be employed where either the quantity of air or the velocity of the airflow will adversely affect other portions of the smoke control system, unduly intensify the fire, disrupt plume dynamics or interfere with exiting. In no case shall airflow toward the fire exceed 200 feet per minute (1.02 m/s). Where the formula in Section 909.7.1 requires airflow to exceed this limit, the airflow method shall not be used.

Related Code Sections


909.7 Fire Protection Systems, Air Flow Design Method
by the use of the airflow method, shall be permitted. The design air flow shall be in accordance with this section. Air flow shall be directed ...
NYC Building Code 2014 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.7 Air Flow Design Method
909.7 Fire Protection Systems, Air Flow Design Method
by the use of the airflow method, shall be permitted. The design air flow shall be in accordance with this section. Air flow shall be directed ...
NYC Building Code 2008 > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.7 Air Flow Design Method
513.7 Exhaust Systems, Airflow Design Method
zones by the use of the airflow method, shall be permitted. The design airflows shall be in accordance with this section. Air-flow shall be directed ...
NYC Mechanical Code 2008 > 5 Exhaust Systems > 513 Smoke Control Systems > 513.7 Airflow Design Method
510.5 Exhaust Systems, Design
Systems for removal of vapors, gases and smoke shall be designed by the constant velocity or equal friction methods. Systems conveying particulate ...
NYC Mechanical Code 2008 > 5 Exhaust Systems > 510 Hazardous Exhaust Systems > 510.5 Design
510.5 Exhaust Systems, Design
Systems for removal of vapors, gases and smoke shall be designed by the constant velocity or equal friction methods. Systems conveying particulate ...
NYC Mechanical Code 2014 > 5 Exhaust Systems > 510 Hazardous Exhaust Systems > 510.5 Design
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