// CODE SNIPPET
421.4.1.1 Ventilation Alternative
JUMP TO FULL CODE CHAPTER
Where an exhaust system is used in lieu of the interlock system required by Section 421.4.1, exhaust ventilation systems shall operate continuously and shall be designed to operate at a negative pressure in relation to the surrounding area. The average velocity of ventilation at the face of the door opening with the door in the fully open position shall not be less than 60 feet per minute (0.3048 m/s) and not less than 45 feet per minute (0.2287 m/s) at any point in the door opening.
Related Code Sections
421.4.1.1 Special Detailed Requirements Based on Use and Occupancy, Ventilation Alternative
Where an exhaust system is used in lieu of the interlock system required by Section 421.4.1, exhaust ventilation systems shall operate continuously ...
Building Code 2012 of South Holland, IL > 4 Special Detailed Requirements Based on Use and Occupancy > 421 Hydrogen Cutoff Rooms > 421.4 Design and Construction > 421.4.1 Opening Protectives > 421.4.1.1 Ventilation Alternative
909.20.3 Fire Protection Systems, Natural Ventilation Alternative
The provisions of Sections 909.20.3.1 through 909.20.3.3 shall apply to ventilation of smokeproof enclosures by natural means ...
Building Code 2012 of South Holland, IL > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative
909.20.3.2 Fire Protection Systems, Vestibule Doors
Where access to the stairway is by way of a vestibule, the door assembly into the vestibule shall be a fire door assembly complying with Section ...
Building Code 2012 of South Holland, IL > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.3 Natural Ventilation Alternative > 909.20.3.2 Vestibule Doors
909.20.4.1 Fire Protection Systems, Vestibule Doors
The door assembly from the building into the vestibule shall be a fire door assembly complying with Section 716.5.3. The door assembly from ...
Building Code 2012 of South Holland, IL > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.4 Mechanical Ventilation Alternative > 909.20.4.1 Vestibule Doors
909.20.4.3 Fire Protection Systems, Smoke Trap
The vestibule ceiling shall be at least 20 inches (508 mm) higher than the door opening into the vestibule to serve as a smoke and heat trap ...
Building Code 2012 of South Holland, IL > 9 Fire Protection Systems > 909 Smoke Control Systems > 909.20 Smokeproof Enclosures > 909.20.4 Mechanical Ventilation Alternative > 909.20.4.3 Smoke Trap