Why ducts deserve their own fire-protection category
Every service building has two kinds of ventilation: supply ventilation (fresh air during normal operation) and smoke extraction (during a fire, to control smoke layers). Both are fire-safety critical — and both are often treated as an afterthought in practice.
We specialize precisely in these ducts. We know where the tricky spots are: penetrations through fire walls, transitions from rectangular to round duct, hangers with metallic clamps, damper boxes.
Supply ventilation — EN 1366-1
Supply ventilation ducts must not transfer fire load between fire compartments during a fire event. We deliver classified build-ups from EI 30 to EI 120 as required — typically with:
- Calcium silicate or mineral wool fire-protection boards in the certified thickness
- Staggered board joints with certified fire-protection screws
- Joints sealed with fire-protection compound
- Properly designed hangers (their own fire rating with their own EI class)
Smoke extraction — EN 1366-8
Smoke extraction ducts have an additional challenge: they must keep working during a fire — i.e. extract smoke without collapsing. Classification here is two-stage: E600 (smoke gas temperature) and EI60 (thermal insulation).
We supply complete solutions including:
- Fire-protection cladding of the ducts (typically core calcium silicate 30–50 mm)
- Hangers with tested load transfer in fire conditions
- Smoke-protection dampers with maintenance / inspection openings
- Compartment-crossing transitions with certified shaft connections
Inspection openings and dampers
Every smoke extraction system needs accessible inspection points. We install certified fire-protection access doors that maintain the full EI class when closed and open without special tools.
Our value-add
- End-to-end concept from one source: consulting, calculation, material selection, installation, documentation.
- Coordination with your existing duct installer: we work in parallel to duct mounting without blocking the build schedule.
- Retrofit in existing buildings: upgrading the fire protection of existing ducts is our daily bread.
- Ongoing maintenance: annual visual inspection and function test of the fire-protection components in your ventilation.
If a fire inspection has flagged ventilation deficiencies, or if you are planning a new hall ventilation system — schedule a meeting. We arrive with detail drawings, not sales brochures.