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SMOKE OR HEAT VENTILATORS
State Fire Marshal Smoke or Heat Ventilators
- Application. The minimum design, construction and performance standard set forth herein for stage and platform smoke or heat ventilators are those deemed necessary to establish conformance to the provisions of these regulations.
- Tested and listed component parts. Component parts, devices, combinations of devices and electrical equipment which have been tested and listed by an approved testing agency for the intended purpose need not be individually retested. Such individually tested and listed component parts, devices and equipment shall be subjected to the performance standard tests to determine their suitability for use in the smoke or heat ventilator.
- Alternate constructions. Ventilators having materials or forms of construction differing from this standard may be investigated and tested in accordance with these regulations, and if found to be substantially equivalent in performance may be given recognition for approval.
- Marking. Units shall be provided with a manufacturers label or other permanent markings clearly identifying the manufacturer and model numbers. Plastics in dome-type ventilators shall be identified by brandmarkings, imprint or other markings acceptable to the State Fire Marshal.
- Framing design. The unit and cover shall be so formed and assembled that they will have the strength and rigidity necessary to resist the abuses to which they are liable to be subject without adversely affecting their performance, and without operational failure due to partial collapse with the resulting reduction of spacings, loosening or displacement of parts, or other serious defects.
- Curb design. The ventilator design shall include provisions for mounting on roof curbs or shall in themselves incorporate a design to provide the equivalent of roof curbs.
- Plastic covers. Plastic covers shall be of the dome type having a continuous curvature with the center not less in height than 10 percent of the span having the least dimension but not less than 5 inches.
- Fail-safe design. The ventilator cover, lid, sidelight or shutter shall be designed to fail safe in the event of fire and shall not fall back over the opening. It shall require a manual operation to reclose the cover, lid, sidelight or shutter.
- Gravity-type ventilators shall have securely attached weights to provide a continuous excess counter-weight of not less than 30 pounds throughout the opening arc of the lid or sidelight.
- Devices used to open ventilators shall be designed to exert a continuous opening force, at all times normal to the lid of not less than 30 pounds. When springs are used they shall not be stressed to more than 50 percent of their capacity when the lid is in a closed position.
- Louvered-type shutters intended for installation in gables shall be of the gravity type. The excess counter-weight shall be not less than 2 pounds per square foot of gross shutter area.
- Automatic heat or smoke detectors shall be placed in the underside of the ventilator at or above the roof line.
- Ventilators and shutters shall be mounted for the tests in a manner simulating their intended use. The lid, cover or sidelight shall be held in a closed position by a fusible link, or an automatic heat or smoke actuated detector or combination thereof, and the fusible link or detector controls.
- The opening counterforce shall be measured at the geometric center of the lid, cover or sidelight. The automatic detector shall be released and measurements of the counterforce taken at various points throughout the opening arc but at not less than at 30 inches and at 60 inches from the plane of the lid when in a closed position, and at a point past 90 inches from the horizontal.
- The opening force of gable-type shutter ventilators shall be measured from the top of the operating bar.
- A detailed description of the unit and its intended operation.
- Engineering data and shop drawings. Shop drawings shall bear the seal or stamp of a registered or licensed engineer or architect attesting to the structural integrity of the ventilator as it relates to the provisions of Section 12-4-100 (f).
- Photographs (4 inches by 5 inches or larger) of the unit with markings identifying component parts of the unit.
- Description and results of the tests performed.