Centrifugal fan BKF

smoke extractorductduct

Overview
The BKF line of dual-purpose rectangular duct fans is designed for daily ventilation and emergency smoke and heat extraction. Suitable for professional, commercial and residential use. Certified for smoke extraction (EN 12101-3) and able to extract 400°C gases for 120 minutes while supporting continuous operation at elevated temperatures for normal ventilation.

Key Benefits

• Robust: Zinc‑magnesium coated steel casing and motor placed outside the air stream for easier inspection and reduced fouling risk.
• Efficient: IEC flange motors (high efficiency) combined with a backward-curved steel impeller for good overall efficiency.
• High performance: Certified F400 (400°C/120 min) smoke and heat extraction; continuous operation at up to 120°C for daily use.
• Dual-purpose design: Works for daily ventilation and emergency smoke/heat extraction, enabling smoke‑free escape routes and extraction of hazardous gases.

Construction & Materials

• Casing: Zinc‑magnesium coated steel (ZM).
• Impeller: Backward-curved impeller in galvanised or pre-galvanised steel.
• Motor: Single speed IE2 or two‑speed motors (page notes also reference IE3 for some configurations). Motor placed outside the air stream. PTC serial built-in motor protection.
• Duct connection: Rectangular flange connections.

Operation & Controls

• Fire rating: 400°C / 120 min (F400) according to EN 12101-3 for smoke extraction.
• Continuous ventilation: rated for continuous transported air up to 120°C.
• Speed control: For single speed motors use a frequency converter with appropriate motor-side filter (sine or du/dt). When used for fire scenarios, frequency converters should be bridged or protected to guarantee function in case of fire (see product instructions).
• Installation: Possible in all positions; install either outside the building or inside (outside fire zone) in well ventilated rooms. Flange connection depth noted as 30 mm.

Performance & Acoustic (selected values)
Performance (example configuration 400V 3~ 50Hz - 4-pol - Y (Star)):
Air flow (max): 2,632 m³/h
Impeller speed: 1,451 rpm
Input power: 315 W (0.315 kW)
Input current: 1 A
Starting current: 4.4 A

Acoustic (examples):
LwA Inlet (measuring vol. 0.3 m³/s): 58 dB(A)
LwA Outlet (measuring vol. 0.3 m³/s): 69 dB(A)
Sound pressure level at 3 m (20 m² Sabin): 58 dB(A)

Certifications & Documentation

• Fire classification and tests to EN 12101-3 (F400 / 120 min) for smoke extraction.
• Product has related documentation including declarations of performance, certificates and declarations of conformity (refer to product documents section).

Applications

• Smoke and heat extraction in emergencies
• Daily ventilation and extraction in commercial and residential installations
• Use where safe egress and hazardous gas extraction may be required

Caractéristiques / spécifications techniques

• Series: BKF
• Article name: BKF 315D4-6-XL/F400
• Article number: #95689
• Voltage (nominal): 400 V
• Frequency: 50 Hz
• Phases: 3~
• Motor circuit connection: Y (star)
• Input power: 315 W (0.315 kW)
• Starting current: 4.4 A
• Input current (nominal): 1 A
• Impeller speed: 1451 rpm
• Air flow (max): 2,632 m³/h
• Max. temperature of transported air (120 min): 400 °C
• Temperature of transported air (continuous): max. 120 °C
• Protection / motor enclosure class: IP55
• Insulation class: F
• ErP: Not ErP relevant
• Weight: 51 kg
• Duct connection type: Rectangular
• Motor type: AC (single-speed IE2 or two-speed; IE3 referenced for some configurations)