3 3 the duct system is constructed of approved

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3. 3. The duct system is constructed of approved materials in accordance with the Florida Building Code, Mechanical and the duct penetrating the wall complies with all of the following requirements: 1. 3.1. The duct shall not exceed 100 square inches (0.06 m 2 ). 2. 3.2. The duct shall be constructed of steel not less than 0.0217 inch (0.55 mm) in thickness. 3. 3.3. The duct shall not have openings that communicate the corridor with adjacent spaces or rooms. 4. 3.4. The duct shall be installed above a ceiling. 5. 3.5. The duct shall not terminate at a wall register in the fire-resistance-rated wall. 6. 3.6. A minimum 12-inch-long (305 mm) by 0.060-inch-thick (1.52 mm) steel sleeve shall be centered in each duct opening. The sleeve shall be secured to both sides of the wall and all four sides of the sleeve with minimum 1 1 / 2 -inch by 1 1 / 2 -inch by 0.060- inch (38 mm by 38 mm by 1.52 mm) steel retaining angles. The retaining angles shall be secured to the sleeve and the wall with No. 10 (M5) screws. The annular space between the steel sleeve and the wall opening shall be filled with mineral wool batting on all sides. 4. 4. Such walls are penetrated by ducted HVAC systems, have a required fire-resistance rating of 1 hour or less, and are in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. For the purposes of this exception, a ducted HVAC system shall be a duct system for conveying supply, return or exhaust air as part of the structure’s HVAC system. Such a duct system shall be constructed of sheet steel not less than No. 26 gage thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals. 717.5.4.1Corridors. Duct and air transfer openings that penetrate corridors shall be protected with dampers as follows:
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1. 1. A corridor damper shall be provided where corridor ceilings, constructed as required for the corridor walls as permitted in Section 708.4, Exception 3, are penetrated. 2. 2. A ceiling radiation damper shall be provided where the ceiling membrane of a fire- resistance-rated floor-ceiling or roof-ceiling assembly, constructed as permitted in Section 708.4, Exception 2, is penetrated. 3. 3. A listed smoke damper designed to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a corridor enclosure required to have smoke and draft control doors in accordance with Section 716.5.3. Exceptions: 1. 1. Smoke dampers are not required where the building is equipped throughout with an approved smoke control system in accordance with Section 909, and smoke dampers are not necessary for the operation and control of the system. 2. 2. Smoke dampers are not required in corridor penetrations where the duct is constructed of steel not less than 0.019 inch (0.48 mm) in thickness and there are no openings serving the corridor . 717.5.5Smoke barriers.
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  • Fall '17
  • LIBERMAN
  • SFRM

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