Tenmat FF102/25 Fire Rated Ventilated Cavity Barrier 1000x35x4mm
Tenmat FF102/25 Fire Rated Ventilated Cavity Barrier 1000x35x4mm is backordered and will ship as soon as it is back in stock.
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This 4 mm Tenmat FF102/25 ventilated cavity barrier provides essential fire protection for building cavities. It expands rapidly under heat, sealing ventilation gaps to prevent flame and smoke from spreading through wall cavities. At just 4mm thick and measuring 1 Meter in length at 35x1000mm, it fits neatly into narrow spaces.
The barrier features fire-rated intumescent (swells when exposed to heat) materials, meeting stringent UK fire regulations. It's specifically designed for use in external cladding and façade systems requiring effective ventilation and fire resistance. Weighing approximately 0.5 kg per piece, it’s easy and safe to handle on-site.
Installation is quick, requiring only standard fixings, with minimal disruption. The barrier maintains airflow during normal conditions yet provides immediate sealing in fire situations.
Suitable for commercial and residential projects, it complies fully with UK building standards, ensuring safety and regulatory compliance.
It’s tested to BS 476 Part 20 and offers up to 60 minutes
Key Features
Made in the UK
Ideal for 25mm ventilated cavities
Offers up to 60 minutes of fire resistance
Tested to BS 476 Part 20
Compatible with timber substrates

Description
Description
This 4 mm Tenmat FF102/25 ventilated cavity barrier provides essential fire protection for building cavities. It expands rapidly under heat, sealing ventilation gaps to prevent flame and smoke from spreading through wall cavities. At just 4mm thick and measuring 1 Meter in length at 35x1000mm, it fits neatly into narrow spaces.
The barrier features fire-rated intumescent (swells when exposed to heat) materials, meeting stringent UK fire regulations. It's specifically designed for use in external cladding and façade systems requiring effective ventilation and fire resistance. Weighing approximately 0.5 kg per piece, it’s easy and safe to handle on-site.
Installation is quick, requiring only standard fixings, with minimal disruption. The barrier maintains airflow during normal conditions yet provides immediate sealing in fire situations.
Suitable for commercial and residential projects, it complies fully with UK building standards, ensuring safety and regulatory compliance.
It’s tested to BS 476 Part 20 and offers up to 60 minutes
Key Features
Made in the UK
Ideal for 25mm ventilated cavities
Offers up to 60 minutes of fire resistance
Tested to BS 476 Part 20
Compatible with timber substrates
Payment & Security
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Fire Resistance Where It Counts

Easy Fit, Proven Performance
Designed for Rainscreen Systems
Made with Intumescent Core
Built to Comply
Our customers tell it better than we do!
Excellent Delivery Service
Order arrived early in morning, delivery staff were excellent and able to place order as close as possible to where I required it. excellent communication through out delivery and after delivery.
Great Experience
Great experience Really pleased with the way my order was dealt with and delivery arrived as advised.
Good product and service
Good product, reasonable price, great service and good customer follow-up. Would recommend and use again.
Great Company
Great company, great product. Delivery was very speedy and items was delivered professionally by a very helpful driver. Would highly recommend.
Great quality wood and fast delivery
Great quality wood and fast delivery The company reached out to make sure that everything was good and the delivery went fine
Excellent service from a great company
Ordered 2T of midnight blue slate chipping (2 pallets of 50 bags each) Very nice product at a great price. Contacted quickly after order to arrange a suitable delivery date. Delivery was as arranged. Customer service is excellent including follow up call to ensure everything went well. All in all I would highly recommend Armstrong Cheshire.
Great Customer Relations
Due to a mistake in communication ( mostly my mistake) the first delivery of bulk aggregate went to an address I used to live at. After asking to have a replacement delivery to the correct address Armstrong Cheshire re-scheduled the delivery within 3 days and with fantastic customer relations. I cannot recommend this company enough.
Ultra Fast Delivery
Ultra fast delivery, technically superlative company, their products are light years ahead of all others. Unbelievable prices. I have been in construction for nearly 70 years now and am still working every day. This company is why I keep getting up in a morning. Thank you dear sirs/ Madam for making life easier
Steel Lintel
Easy to pick product online, said 10 days delivery but got the product in 4 days, excellent service and prices