Fire damper ductwork floor penetration

Smoke dampers have two general functions: Because a fire-resistance-rated corridor is intended to be an exit access component providing a limited degree of occupant protection during egress activities, it is logical that air openings into the corridor be addressed. If the ductwork incorporated in a smoke extraction system is wholly contained within the fire compartment, it must at least be capable of resisting the anticipated smoke temperatures generated during the development of a fire. In the case of fire resisting ducts this is particularly important as they are often covered up and inaccessible after installation, so it is important to get it right. These are shown in figure 1 below.
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Section 717 Ducts and Air Transfer Openings

No other seal type can be used without an assessment or consultation with the manufacturer. They are installed in or on the construction element in order to restore its fire-resistance rating. These will generally be lower than the temperatures specified in BS Fire dampers are distinguished by their degree of fire resistance, by their aeraulic properties as well as by their installation ease. As the fan stays on, the spring loaded design facilitates the damper to spring shut against air pressure.
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Fire dampers | TROX GmbH

North American fire dampers, ready for installation in Durasteel fire-resistance rated pressurisation ductwork. Fire resisting ductwork usually needs to pass through compartment walls or floors that will have a prescribed fire resistance period in terms of the load-bearing capacity, integrity and insulation criteria, for durations of 30 to minutes. ABC Fire resisting board is made of special fire resistant Product description minerals materials and has undergone a sophisticated process. At the time of writing, the only published standard relevant to fire-resisting ductwork is BS EN , Smoke and heat control systems, Part 7: Intumescent damper insert. Ducts are used as part of an approved smoke control system designed and installed in accordance with Section and where the fire damper will interfere with the operation of the smoke control system.
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They can simply be sealed with a firestop caulk, such as an all-purpose intumescent firestop sealant. This requires that sufficient fire safety information be provided for persons to operate and maintain the building in reasonable safety. Firestopping non-dampered heating, ventilation, and air-conditioning HVAC duct penetrations in fire-rated walls is more involved than installing that ubiquitous red caulk into the space between the duct and the periphery of the opening. To achieve this they are tested with a grid on either side to prevent combustibles to be stored too close to hot parts or flaming. Fire Dampers for Use in Dynamic Systems are required at locations in which fan pressure will be on during a fire incident, and are expected to be able to operate close against the air velocity and pressure produced by the system fan. It has agreed to remove these rules partly because they might encourage lay persons without an experienced background in the testing and approval of fire resisting ducts to attempt to assess products. Smoke dampers are not required in corridor penetrations where the duct is constructed of steel not less than 0.
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