Thursday 21 September 2023

ZEROplus Announce High Performing Smoke Classification for Steel Door Dropseal

Leading door hardware supplier, ZEROplus are proud to have achieved the high-performing BS EN 1634-3 smoke classification for their fire-rated steel door dropseal.

The 355A Automatic Dropseal underwent stringent air leakage tests to ensure its leakage rate doesn't exceed 3m³/h per meter at 25 Pa.

The new testing means the fire-rated, steel-door dropseal has gained the additional BS EN 1634-3 smoke rating — the highest classification possible for cold smoke seals.

With the most common cause of fire death being recorded as being 'overcome by gas or smoke' by the Fire Rescue Service last year, the door hardware supplier is delighted with the new rating as the dangers of smoke inhalation can't be understated.

Mark Lockley, Managing Director of ZEROplus, explains:

“The smoke produced by an indoor fire is highly toxic.

“All combustible materials cause poisonous smoke when burning, and the more manufactured materials set alight, the more toxins are emitted.

“As a significant two-thirds of fabrics are now made from petrochemicals and most homes and business premises contain increasing amounts of synthetic materials, the smoke from a fire today poses an ever more serious threat.

“In fact, it's estimated that as many as 50% to 80% of all fire-related deaths are caused by smoke inhalation.”

Along with the high level of smoke safety, the 355A Automatic Dropseal is fire-rated for steel doors with up to 180 minutes of fire integrity to BS EN 1634-1:2014, making it the ideal addition to any steel fire door.

Mark continues:

“Smoke can spread through a building at an alarming speed.

“The smoke from a fire wants to rise, but in a building, the smoke becomes restricted by the ceiling, so instead of moving upwards, it spreads outwards in all directions.

“Smoke will find its way through gaps — from holes in walls and ceilings to cracks in floors and around doors.

“Therefore, it's imperative to prevent the passage of smoke between occupancies and high-risk areas of a building as much as possible. 

“That's why we're so pleased with the 355A's new smoke rating.”

A reversible OEM dropseal, the 355A fits neatly into the inverted floor channel.

Made from anodised aluminium with double silicone extrusion, the fire and smoke-rated dropseal has a mortice mechanism that lifts the dropseal when the door is opened and seals the bottom of the door when closed, preventing the passage of toxic smoke.

The 355A dropseal is available in a wide range of sizes and can be ordered immediately from stock.

To find out more about dropseals from ZEROplus and their extensive range of fire door hardware, please visit or call 01785 282 910.

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