Design fire size is expressed in terms of heat release rate.
Atrium smoke evacuation system.
Smoke extractors used in conjunction with smoke curtains is the preferred solution to comply with nfpa92b.
An atrium smoke evacuation system is generally intended for use by fire service personnel to clear smoke from a building after a fire has been controlled.
Referenced by both the international code council and nfpa codes and standards it s the starting point for any smoke control system design.
Specifically the ibc requires an atrium smoke control system when an atrium is connecting more than two floors.
Rooftop units may be configured to run in reverse mode in which case the curtains deploy to channel the smoke vertically and direct smoke to the atrium for evacuation.
The construction of these systems is fraught with issues that take discipline to overcome.
Rooflight aovs r are installed in the roof above the atrium with a free area not less than 10 of the effective floor.
The atrium is separated from the hospital by a one hour fire resistive partition with glazed openings as allowed per the building code and from the medical office building by a 2 hour fire resistant rated occupancy.
Typically ranging from 1 800 to 8 000 btu per second design fires should be evaluated as part of a smoke control system s engineering analysis.
The atrium has a fully mechanical smoke evacuation system per the building and life safety code the building is fully sprinklered.
Design fires which can be deemed steady or unsteady have a major impact on an atrium smoke control system.
As you can see in this video the m4000 curtain is essentially invisible being retracted up into the ceiling itself complete with matching trim for a seamless look.
It is therefore not usually linked to an automatic detection system.
The earlier that the atrium smoke control system design can be performed the easier it is to accommodate makeup air.
However sometimes nfpa 92 is used as a panacea to solve any number of problems for which the standard may not be the correct.
The atrium of the facebook office as well as the general open floor plan can make smoke control seemingly impossible without an effective smoke control curtain system.
Atrium smoke management system design by ray sinclair principal consulting engineers scientists in large volume spaces such as atria and covered malls smoke management systems are often an important aspect of fire protection with their primary goal being to ensure that the impact of smoke and heat on occupants is not life threatening nfpa.
