1 ceiling radiation damper and grille may be connecteddi.
Ceiling radiation damper requirements.
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 satisfied in two ways.
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.
Connection of ceiling radiation damper air device neck and steel duct drop see general information connections may be satisfied in two ways.
Figure 2 shows actuated life safety dampers.
If the radiation damper is 12 x 12 nominal the ceiling membrane opening is larger than 13 x 13 a thermal blanket is required.
Of ceiling damper i e.
Ceiling radiation damper and air device neck may be connected directly to the duct drop see detail a figure.
A thermal blanket is required.
Radiation damper could have a maximum ceiling membrane opening of 13 in.
The design may also call for the use of duct outlet protection system a and or b which are described in the.
Connection of ceiling radiation damper grille and steel duct drop may be satisifed in two ways.
Figure 2 actuated fire smoke and combination dampers.
Figure 1 non actuated heat and fire dampers.
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.
The ceiling radiation damper described in the design reflects the damper used during the ul 263 fire exposure test.
Figure 1 shows a ceiling damper used to prevent heat transfer a curtain damper and a multi blade fire damper.
Depending on the application they have varying requirements for periodic testing.
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.
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.
