Ceiling Radiation Damper Requirements

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

Ceiling radiation damper requirements.

For assemblies utilizing an acoustical ceiling a hinged door type damper typically protects hvac openings. The ceiling radiation damper described in the design reflects the damper used during the ul 263 fire exposure test. Figure 2 actuated fire smoke and combination dampers. Er than nominal size of ceiling damper i e.

Connection of ceiling radiation damper air device neck and steel duct drop see general information connections may be satisfied in two ways. Figure 1 shows a ceiling damper used to prevent heat transfer a curtain damper and a multi blade fire damper. 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. Connection of ceiling radiation damper grille and steel duct drop may be satisifed in two ways.

Figure 1 non actuated heat and fire dampers. Ceiling radiation damper and air device neck may be connected directly to the duct drop see detail a figure. Depending on the application they have varying requirements for periodic testing. Figure 2 shows actuated life safety dampers.

A thermal blanket is required. 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. 1 ceiling radiation damper and grille may be connecteddi. 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.

Of ceiling damper i e. If the radiation damper is 12 x 12 nominal the ceiling membrane opening is larger than 13 x 13 a thermal blanket is required. Connection of ceiling radiation damper grille and steel duct drop may be satisfied in two ways. Radiation damper could have a maximum ceiling membrane opening of 13 in.