The double-inlet centrifugal fan is the heart of your commercial kitchen hood: it draws in air laden with smoke, vapours and grease and extracts it to the outside. It works on the principle of centrifugal force, generated by the rotation of a scroll-shaped impeller housed in its characteristic volute casing.

How to choose your double-inlet centrifugal fan

Choosing a double-inlet centrifugal fan starts with the required airflow rate, expressed in m³/h: our range runs from around 1,400 m³/h (Ventilsogood DD, 230V single-phase) to 9,000 m³/h (DD15/15, 380V three-phase). In between, you'll find the flow rates most commonly needed in catering, around 2,000 to 4,000 m³/h, which cover most standard kitchen hoods.

The fan size matters just as much: our 7/7, 7/9 and 8/9 models fit directly inside the body of a dynamic hood, while sizes 9/7, 9/9 and above (10/10, 12/12, 15/15) are usually installed in a separate extraction fan box, which noticeably reduces noise in the kitchen. Always check the dimensions of your original motor before ordering a replacement.

The power supply must also match your installation: almost the entire range runs on 230V single-phase, only the DD15/15 9,000 m³/h requires a 380V three-phase supply in a fan box. A single-phase motor is controlled with a fan speed controller sized to its current rating, a three-phase motor with a suitable variable frequency drive.

Double-inlet centrifugal fan sizes and uses

The 7/7, 7/9 and 8/9 motors (1,400 to around 3,000 m³/h) suit compact kitchen hoods: snack bars, kebab shops, pizzerias, food trucks. These include references such as the DDM7/7 1,700 m³/h or the DD7/9 2,600 m³/h, valued for their ease of direct fitting into the hood.

The 9/7 and 9/9 motors (around 2,900 to 3,600 m³/h) equip busier kitchens or remote fan boxes, with a central impeller that limits vibration. The DD9/9 Sodeca 3,600 m³/h is listed with a 400°/120 rating on its data sheet: please check this precisely with our team before relying on this criterion for a project subject to smoke extraction regulations, as the C4 (400°C/30 min) and F400/120 (400°C/120 min) classifications are never interchangeable.

The larger sizes 10/10, 12/12 and 15/15 (4,000 to 9,000 m³/h) are reserved for extraction fan boxes serving large commercial kitchens or institutional catering. Beyond around 3,000 m³/h, it is in any case generally advisable to opt for a remote fan box motor rather than an integrated one, to preserve acoustic comfort in the kitchen.

Comparison table of double-inlet centrifugal fans

Points to check before ordering

• Dimensions of the original motor: size (7/7, 9/9, 10/10...), outlet diameter and fixing must match your current hood or fan box.
• Actual airflow required: the free airflow stated on the product sheet is a reference point, actual performance depends on the ductwork (duct length, elbows, filters, air inlet).
• Power supply: 230V single-phase for almost the entire range, 380V three-phase for the DD15/15 only.
• Speed controller compatibility: a single-phase motor is regulated by voltage according to its current rating, a three-phase motor requires a variable frequency drive, never the other way round.
• Smoke extraction standard: if your project requires a C4 or F400/120 classification, have the exact reference confirmed with our team before ordering, as these two classifications are not equivalent.

Complete your order with

Consider the accessories that go with a double-inlet centrifugal fan replacement: the fitting kit (gasket and fixings), the mounting frame, the support feet with anti-vibration mounts for fitting in a fan box, and the replacement capacitor in case of a starting fault. You'll also find our full range of commercial kitchen hood motors for motors outside the double-inlet centrifugal range.