Open State Cavity Barrier for ventilated cavities
ARC Open State Cavity Barriers (OSCB) are designed for installation within cavities where ventilation is required in service use. Manufactured from non-combustible rockfibre mineral wool with a reactive intumescent layer, the cavity barrier can provide an air gap of up to either 25mm or 44mm.
The intumescent layer will rapidly expand when exposed to heat in a fire event, closing off the air gap and preventing vertical fire spread within the external wall cavity.
Suitable for installation horizontally, ARC Open State Cavity Barriers should be partnered with ARC Fire Stop Slab installed vertically for a complete cavity barrier solution.
OSCB25
| Cavity widths available | 100 – 450mmm |
| Third Party Certification | IFC Certification number: IFCC 1935 |
| Max. air gap | 25mm |
| Colour | Red with green strip |
| Fire performance: Integrity | 60 mins |
| Fire performance: Insulation | 60 mins |
| Dimensions | Depth : Cavity width less 25mm - Thickness: 82mm - Length: 1200mm |
| Fixing method | ARC OSCB Fixing Bracket |
OSCBPLUS25
| Cavity widths available | 100 - 300mm |
| Third Party Certification | IFC Certification number: IFCC 1935 |
| Max. air gap | 25mm |
| Colour | Red with blue strip |
| Fire performance: Integrity | 120 mins |
| Fire performance: Insulation | 120 mins |
| Dimensions | Depth : Cavity width less 25mm - Thickness: 82mm - Length: 1200mm |
| Fixing method | ARC OSCB Fixing Bracket |
OSCB44
| Cavity widths available | 100 – 300mm |
| Third Party Certification | IFC Certification number: IFCC 1935 |
| Max. air gap | 44mm |
| Colour | Red with yellow strip |
| Fire performance; Integrity | 60 mins |
| Fire performance: Insulation | 60 mins |
| Dimensions | Depth : Cavity width less 44mm - Thickness: 82mm - Length: 1200mm |
| Fixing method | ARC OSCB Fixing Bracket only |
Notes: see separate fixing details for specific bracket specification relevant to cavity width and barrier type.
Please contact us for requirements outside of these ranges. Non standard details, sizes and test data may be available.
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