Ceiling Radiation Damper Requirements

Ceiling radiation dampers serve a critical safety element where hvac ducting penetrates a fire rated ceiling.

Ceiling radiation damper requirements.

1 ceiling radiation damper and grille may be connecteddi. Figure 2 shows actuated life safety dampers. For assemblies utilizing an acoustical ceiling a hinged door type damper typically protects hvac openings. Ceiling fire damper ul classified radiation dampers ul fire rated floor ceiling assemblies and roof ceiling assemblies require specially tested and classified ceiling dampers also called ceiling fire dampers or radiation dampers to provide fire and heat protection where hvac components penetrate the ceiling membrane.

Figure 2 actuated fire smoke and combination dampers. Connection of ceiling radiation damper grille and steel duct drop may be satisfied in two ways. Ceiling radiation damper and air device neck may be connected directly to the duct drop see detail a figure. A ceiling radiation damper shall be provided where the ceiling membrane of a fire resistance rated floor ceiling or roof ceiling assembly 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.

Ceiling radiation dampers shall comply with ul 555c and shall be installed in accordance with the manufacturer s installation instructions in the fire resistive ceiling element of floor ceiling and roof ceiling assemblies where required by the building code fire dampers not meeting the temperature limitation of ceiling radiation dampers shall not be used as a substitute. When elevated temperatures are detected by a ceiling radiation damper the damper activates to close off the area of the open ceiling typically located above a supply air register and in doing so maintains the fire rated integrity of the ceiling. Radiation damper could have a maximum ceiling membrane opening of 13 in. Connection of ceiling radiation damper air device neck and steel duct drop see general information connections may be satisfied in two ways.

If the radiation damper is 12 x 12 nominal the ceiling membrane opening is larger than 13 x 13 a thermal blanket is required. Figure 1 non actuated heat and fire dampers. Connection of ceiling radiation damper grille and steel duct drop may be satisifed in two ways. Of ceiling damper i e.

If the radiation damper is 12 x 12 305mm x 305mm nominal the ceiling membrane opening is larger than 13 x 13 330mm x 330mm. Er than nominal size of ceiling damper i e. Figure 1 shows a ceiling damper used to prevent heat transfer a curtain damper and a multi blade fire damper. A thermal blanket is required.