Connection of ceiling radiation damper grille and steel duct drop may be satisifed in two ways.
Ceiling radiation damper requirements.
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.
Ceiling radiation damper and air device neck may be connected directly to the duct drop see detail a figure.
1 ceiling radiation damper and grille may be connecteddi.
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.
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.
For assemblies utilizing an acoustical ceiling a hinged door type damper typically protects hvac openings.
Ceiling radiation dampers serve a critical safety element where hvac ducting penetrates a fire rated ceiling.
A thermal blanket is required.
Figure 2 shows actuated life safety dampers.
Er than nominal size 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.
The design may also call for the use of duct outlet protection system a and or b which are described in the.
Depending on the application they have varying requirements for periodic testing.
Figure 2 actuated fire smoke and combination dampers.
The ceiling radiation damper described in the design reflects the damper used during the ul 263 fire exposure test.
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.
Connection of ceiling radiation damper air device neck and steel duct drop see general information connections may be satisfied in two ways.
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 1 non actuated heat and fire dampers.
Of ceiling damper i e.
