Failsafe Operations

by Stacy Rinella | August 23, 2024 7:27 am

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Fire-rated counter doors are a critical safety feature in commercial spaces that help contain the spread of fire and give first responders time to act. Used in a variety of settings, from kitchens and food preparation areas to pharmacies and healthcare facilities, these steel counter doors enhance the safety of occupants and protect property by closing to contain fire and smoke. While the steel curtain and its thickness are frequently the focus when selecting a fire-rated counter door, commercial architects can now specify many other features that enhance performance as well as style.

 

Beyond the steel curtain

Steel has long been the material of choice for fire-rated counter door curtains, and for good reason. First, steel has an extremely high melting point of about 1,400°C (2,500°F). This allows the steel curtain of the door to withstand high temperatures for extended periods without losing structural integrity. Steel does not ignite or contribute to flame spread, which is crucial for containing fires and preventing them from spreading to other areas, and its strength and resilience resist bending, cracking, and breaking, even under intense heat. These characteristics of steel make it an excellent choice for counter fire doors, allowing many models to offer UL-rated fire protection in the range of 1 to 3 hours.

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While steel is ideal for flames and heat, fire-rated counter doors need more than a steel curtain to be effective. With fire comes smoke, and smoke presents a different kind of challenge to door designs. Doors that are highly effective against both fire and smoke include a formidable steel curtain plus other features that deliver a more comprehensive solution. These features can include:

• Added safety and support from other steel components: Fire-rated counter doors have a galvanized steel hood that encloses the curtain and provides extra fire protection at the head of the door. These models also include other steel components like a shaft that supports the curtain, brackets that reinforce the counter-balance shaft and curtain, and guide assemblies that carry the full door weight. Together, the steel components help maintain the structural integrity of the door during a fire.
• Smoke-mitigating gaskets: Some manufacturers now offer fire-rated counter doors with an integrated gasket system that meets the UL 1784 Standard for Air Leakage Tests of Door Assemblies required by the International Building Code. To comply with this standard, the door assembly cannot exceed an air leakage rate of 0.08 m3 (3 cf) per minute per square foot of door opening at both ambient and elevated temperatures of 204 C (400 F). This added level of smoke control not only helps protect people and property from dangerous smoke exposure but also helps maintain visibility for firefighters to evacuate building occupants and contain the fire.
• Failsafe operation and fire alarm integration: For a counter fire door to be effective, it has to close dependably during a fire event. Advanced door designs provide failsafe operation by using operators that ensure reliable closing when the fire alarm goes off, not when the fire reaches the door. These operators readily integrate with a building’s fire alarm system or local smoke detectors and receive an electrical signal from the connected system or device that prompts the door to close during a fire emergency. Other systems use a fusible link that requires a specific ambient temperature to be reached before the door will close. This allows smoke to travel through the building much more rapidly before the fire doors will close.

 

With steel’s superior fire-resistance properties, plus advances in integrated smoke gasket systems and failsafe operating features, commercial architects now have more robust options for delivering fire safety, but that is not all.

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Safety without sacrificing aesthetics

The latest fire-rated counter doors not only excel in safety and performance but also offer aesthetic features that allow them to blend seamlessly into any architectural design. New advancements boast some of the smallest footprints yet, shrinking components like the door hood that encloses the curtain when the door is open. Compacting the design to as little as 216 mm (8.5 in.) of headspace improves the door’s appearance and frees up space above the door opening for other uses. Likewise, other features, such as low-profile tubular operators that are hidden in a compact coil box, end caps that conceal assemblies, and bottom bars that meld into the soffit further enhance these more streamlined styles.

Lastly, no modern door design would be complete without color. The wider, more vibrant palette of shades and finishes now available for counter fire doors also includes color matching for components like bottom bars and fasteners. By accounting for color in all the visible elements, counter fire doors are now notably more visually pleasing and complementary within their broader design contexts.

 

Merging performance and design

Fire-rated counter doors have become more than just a safety feature. Combining the exceptional fire protection of steel with new design advances such as sophisticated smoke control systems, failsafe operating mechanisms, and aesthetic enhancements, manufacturers are providing architects with a wealth of options beyond basic safety. These doors not only ensure superior fire protection but also offer sleek designs and vibrant colors that can enhance the visual appeal of any space. This fusion of safety and style opens new possibilities for architects to create spaces that are both secure and aesthetically pleasing, making fire-rated counter doors a dynamic addition to modern architecture.

 

With 16 years of experience in manufacturing and building materials, Heather Bender currently serves as the director of commercial product marketing at Clopay Corporation. Excelling in product management, she adeptly handles product inception to commercialization. Heather can be contacted at: hbender@clopay.com.

Source URL: https://www.metalarchitecture.com/articles/failsafe-operations/

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