// CODE SNIPPET
911.2 Required Deflagration Venting
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Areas that are required to be provided with deflagration venting shall comply with the following:
- Walls, ceilings and roofs exposing surrounding areas shall be designed to resist a minimum internal pressure of 100 pounds per square foot (psf) (4788 Pa). The minimum internal design pressure shall be not less than five times the maximum internal relief pressure specified in Item 5 of this section.
- Deflagration venting shall be designed to prevent unacceptable structural damage. Where relieving a deflagration, vent closures shall not produce projectiles of sufficient velocity and mass to cause life threatening injuries to the occupants or other persons on the property or adjacent public ways.
- The aggregate clear area of vents and venting devices shall be governed by the pressure resistance of the construction assemblies specified in Item 1 of this section and the maximum internal pressure allowed by Item 5 of this section.
- 5.1. Exterior walls designed to release outward.
- 5.2. Hatch covers.
- 5.3. Outward swinging doors.
- 5.4. Roofs designed to uplift.
- 5.5. Venting devices listed for the purpose.
- Vents designed to remain attached to the building when venting a deflagration shall be so located that the discharge opening shall be not less than 10 feet (3048 mm) vertically from window openings and exits in the building and 20 feet (6096 mm) horizontally from exits in the building, from window openings and exits in adjacent buildings on the same lot and from the lot line.
- Discharge from vents shall not be into the interior of the building.