Maximum size of permitted opening equals maximum size of available listed ceiling radiation dampers.
Ceiling radiation damper vs fire damper.
Fusible link temperature set point 3.
Collars can be round oval or square rectangular.
For ceiling radiation dampers however since ceiling radiation dampers serve a somewhat different purpose than the other damper types there is often confusion about where a ceiling radiation damper should be used.
Ceiling radiation damper for square rectangular or round duct nailor ceiling dampers or ceiling radiation dampers as they are commonly called are designed to function as a fire and heat barrier in air duct openings penetrating fire resistive membrane ceilings.
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 membrane 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 12 x 12 nominal ceiling radiation damper could have a maximum ceiling membrane opening of 13 x 13.
Let s examine the protection provided by each type of damper.
To better understand ceiling radiation dampers.
Fire dampers.
Opening in ceiling membrane see page 1 may be up to one inch larger than the nominal size of the ceiling radiation damper i e.
Ceiling fire dampers also known as radiation dampers are designed and tested to limit the radiant heat transfer through an air inlet outlet opening in the ceiling membrane of a fire resistance rated floor ceiling or roof ceiling assembly.
Ceiling radiation dampers are required in fire rated floor ceiling and roof ceiling assemblies and where local codes dictate.
Type a b or c 2.
Sleeves are both standard as well as required on motorized fire smoke dampers and smoke dampers only.
Thermal blanket 5.
Micro switch ceiling radiation dampers 1.
On a type c damper the collar is the portion of the damper that attaches to the duct.
Sleeves are optional on other products such as fire dampers air control dampers and ceiling radiation dampers.
Orientation vertical or horizontal 4.
Unlike spring loaded fire dampers and smoke dampers ceiling radiation dampers from lloyd industries limit the transfer of heat into attics or through openings in the ceilings and floors.
Fusible link temperature set point 3.
A sleeve and or angles will not be included on these products unless specified on the purchase order.
Preventing the transfer of heat and flames into attic and crawlspaces is essential in limiting the amount of damage done in the event of a fire.
Application ul fire rated floor ceiling assemblies and roof ceiling assemblies require specially tested and classified ceiling dampers to provide fire and heat protection where hvac components penetrate the ceiling membrane.
