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Low pressure
Low-pressure centrifugal fans — silent ducted ventilation for residential and commercial use
Low-pressure centrifugal fans are the foundational category of ducted mechanical ventilation — the equipment that provides extraction or supply in simple duct networks with short to medium duct runs and moderate hydraulic resistances, up to 200–300 Pa. The centrifugal rotor with forward-curved or radial blades generates an airflow perpendicular to the rotation axis, delivering static pressure superior to axial fans but with significantly lower noise levels than medium and high-pressure models.
They are the right solution for residential mechanical ventilation — bathrooms, kitchens, bedrooms and hallways in apartments and houses — where duct runs are 2–8 metres long with a few bends and distribution grilles. They are also widely used in small and medium offices, retail shops, lightly ventilated restaurants, medical consulting rooms, classrooms and any commercial space with moderate ventilation requirements. Silent operation at low and medium airflows — below 40 dB(A) for compact models — makes them preferable to axial fans in permanently occupied spaces.
The ventilation.ro range includes Casals and Nicotra Gebhardt models with airflows from 200 m³/h to 4,000 m³/h, with circular or rectangular connections, single-phase (230V), with standard speed controller compatibility. Galvanised steel or ABS plastic casing allows wall, false ceiling or duct mounting.
How to choose: calculate the total static pressure of the installation (ducts + bends + grilles + filters). If the sum exceeds 300 Pa, move to the medium-pressure category. If the sum is below 100 Pa and the installation has no ductwork, an axial fan may be sufficient and less expensive. The optimal range for low-pressure centrifugal: 100–300 Pa, with airflows of 200–4,000 m³/h.
👉 Medium-pressure centrifugal fans — for longer and more complex installations 👉 Inline fans — compact duct alternative
Centrifugal fan DDM 133/190 7725A6 1F 2P 1V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 7/7 E6G34051F 4P 1V
DDM 7/7 E6G34051F 4P 1V
In stock
Centrifugal fan BD 10/10 M4 0,59kW
In stock
Centrifugal fan BD 10/10 M4 0.59 kW 3V
BD 10/10 M4 0.59 kW 3V
In stock
Centrifugal fan BD 10/8 M4 0.59 kW
BD 10/8 M4 0.59 kW
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Centrifugal fan BD 10/8 M4 0.59 kW 3V
BD 10/8 M4 0.59 kW 3V
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Centrifugal fan BD 10/8 M6 0.21 kW
BD 10/8 M6 0.21 kW
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Centrifugal fan BD 12/12 M6 0.76 kW
The double-width double-inlet (DWDI) centrifugal fan BD 12/12 M6 by Casals delivers 6510 m³/h at 0.76 kW, single-phase 230 V / 50 Hz, closed IP55 motor with insulation class F and integrated thermal protection.
Galvanised steel casing, glass fibre reinforced polyamide impeller, anti-vibration flexible arm system and IP65 connection box. Voltage-based speed control.
Also available in a sound-insulated BOX version for duct mounting.
Weight: 27 kg. In stock.
In stock
Centrifugal fan BD 12/12 M6 0.79 kW 3V
BD 12/12 M6 0.79 kW 3V
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Centrifugal fan BD 12/12 T6 1,1kW
Casals BD 12/12 T6 — centrifugal fan with double width double inlet (DWDI), designed for assembly in ventilation boxes, air handling units (AHU) and industrial kitchen hoods.
Maximum airflow 6,450 m³/h at 945 rpm, power 1.1 kW, motor efficiency 78.1%, ERP efficiency grade N=47.86 — exceeds European requirement of 44.
PA6 polyamide fibreglass-reinforced impeller with forward curved double inlet blades. Galvanised steel casing.
Three-phase STC90 motor, current 3.78A at 400V / 6.54A at 230V, motor protection IP54, terminal box IP65, insulation Class F, maximum air temperature 60°C.
Exclusive Casals motor-impeller fixing system via flexible silent block arms — vibrations eliminated at source. Mounting feet included.
Total weight 27 kg.
In stock
Centrifugal fan BD 12/9 M6 0.79 kW 3V
BD 12/9 M6 0.79 kW 3V
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Centrifugal fan BD 12/9 T6 1,1 kW
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Centrifugal fan BD 15/15 T6 2,2kW
BD 15/15 T6 2,2kW
In stock
Centrifugal fan BD 7/7 M4 0.12 kW 3V
BD 7/7 M4 0.12 kW 3V
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Centrifugal fan BD 7/7 M4 0.13 kW
BD 7/7 M4 0.12 kW
In stock
Centrifugal fan BD 7/7 M6 0.04kW
BD 7/7 M6 0.04kW
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Centrifugal fan BD 9/7 M4 0.35 kW
BD 9/7 M4 0.35 kW
Double inlet centrifugal fan
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Centrifugal fan BD 9/7 M4 0.35 kW 3V
BD 9/7 M4 0.35 kW 3V
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Centrifugal fan BD 9/7 M6 0.13kW
BD 9/7 M6 0.13kW
Double inlet centrifugal fan
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Centrifugal fan BD 9/9 M4 0.35 kW
In stock
Centrifugal fan BD 9/9 M4 0.35 kW 3V
BD 9/9 M4 0.35 kW 3V
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Centrifugal fan BD 9/9 M6 0,13kW
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Centrifugal fan DD 10/10 M9N0 3F 4P 1V
The double-width double-inlet (DWDI) centrifugal fan DD 10/10 M9F1 by NICOTRA Gebhardt delivers up to 7100 m³/h airflow with a 1500 W three-phase motor, 400 V / 4-pole, IP55 protection and insulation class F.
Inverter speed control, galvanised steel construction, AMCA 210/99 certified performance.
Available as standard unit or integrated in a sound-insulated plenum BOX enclosure.
Weight: 15 kg. In stock.
In stock
Centrifugal fan DD 12/12 M92E 3F 6P
High performance centrifugal fan DD
In stock
Centrifugal fan DD 12/12 M9F1 3F 4P 1V
DD 12/12 M9F1 3F 4P 1V
High performance centrifugal fan DD
In stock
Centrifugal fan DD 18/18 142974 3F 8P 1V
High performance centrifugal fan DD
In stock
Centrifugal fan DD 7/7 141083 1F 4P 1V
High performance centrifugal fan DD
In stock
Centrifugal fan DD 9/9 M96R 1F 4P 1V
Nicotra Gebhardt DD series double width double inlet (DWDI) centrifugal fan, size 9/9, with M96R single-phase 4-pole motor (~1,400 rpm / 50Hz), direct drive. Low-pressure bare fan without own housing — designed for integration into air handling units (AHU), plenums, professional kitchen hoods, acoustic enclosures or air treatment equipment. Galvanised steel forward-curved impeller, motor with integrated thermal overload protection, insulation class F, IP54. Discharge direction configurable at installation. RoHS and ErP compliant.
In stock
Centrifugal fan DD12/9 1429F9 3F 4P 1V
DD 12/9 1429F9 3F 4P 1V +FL +TEL +SCT
High performance centrifugal fan DD
Centrifugal fan DDM 7/7 E6G3309 3F 4P 1V
DDM 7/7 E6G3309 3F 4P 1V
In stock
Centrifugal fan DDM 10/10 E6G3704 1F 4P 1V
DDM 10/10 E6G3704 1F 4P 1V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 10/10 E6G3706 3F 4P 2V
DDM 10/10 E6G3706 3F 4P 2V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 10/8 E6G3603 3F 4P 1V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 10/8 E6G3604 1F 4P
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 12/12 E6G3702 1F 6P in BOX
Nicotra Gebhardt DDM 12/12 E6G3702 double-width double-inlet (DWDI) centrifugal fan, pre-mounted in acoustic plenum BOX enclosure.
External rotor motor (ERM) single-phase 6-pole — ~900 rpm at 50Hz versus ~1,400 rpm for 4-pole motors.
Lower speed means significantly reduced noise, lower energy consumption and quieter operation — the defining advantage over DDM 12/12 variants with 4-pole motors.
IP54, Class F insulation, integrated thermal protection, direct drive without belt.
BOX with polyurethane insulation, aluminium frame, removable side panel for rapid access to motor and impeller.
For AHU, plenums, commercial ventilation and acoustically sensitive spaces.
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Centrifugal fan DDM 12/12 M7A2 3F 4P 2V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 280/204 E6G3706 3F 4P 1V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 7/7 E5G3403 3F 4P 1V
DDM 7/7 E5G3403 3F 4P 1V
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Centrifugal fan DDM 8/9 TIGHT E6G3405 1F 4P 1V
High performance centrifugal fan DDM
In stock
Centrifugal fan DDM 9/7 E6G3603 3F 4P 1V
High performance centrifugal fan DDM
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DD 10/10 M9F1 three-phase 4-pole centrifugal fan in acoustic BOX enclosure — 7,000 m³/h
Nicotra Gebhardt DD 10/10 M9F1 double-width double-inlet (DWDI) centrifugal fan, mounted in acoustic BOX enclosure.
Three-phase 4-pole motor, 1,500W nominal, 230/400V D/Y, 1,420 rpm / 50Hz.
Maximum airflow ~7,000 m³/h.
Maximum power consumption: 3,616W, maximum current: 5.6A.
Motor IP55, Class F insulation, integrated thermal protection.
Inverter-compatible (+SCT).
The acoustic BOX enclosure significantly reduces noise transmission to the installation space — complete solution for AHU integration, plenums or industrial installations with noise constraints.
Direct drive, no belt, no periodic maintenance.
In stock
DDM 9/9 E6G3501 Double-Inlet Centrifugal Fan – ERM Motor, 3435 m³/h, 230V
The double-width double-inlet (DWDI) centrifugal fan DDM 9/9 E6G3501 by Nicotra Gebhardt delivers 3435 m³/h via an external rotor motor (ERM) rated at 0.55 kW / 230 V / 4-pole, with integrated thermal protection.
The galvanised steel forward-curved blade impeller is dynamically balanced to ISO 1940, ensuring vibration-free, quiet operation. Inlet diameter Ø298 mm.
Available integrated in an insulated plenum BOX (galvanised or RAL 9010 steel, 6/10 mm insulation) or in plug & play configuration with speed control kit.
Weight: 17 kg. In stock.
In stock
