Centrifugal Roof Extractor Fan

When roof exhaust is no longer simply "discharge directly outside" but requires overcoming duct resistance, filter pressure drop, or centralized conveyance of fumes/exhaust gases to purification equipment before discharge, the pressure of ordinary axial roof fans proves inadequate - enough airflow but insufficient pressure, weak suction at terminal outlets, fumes not fully extracted, exhaust gases spreading everywhere. Our factory's Centrifugal roof extractor fan adopts centrifugal impeller technology, delivering higher static pressure alongside high airflow, purpose-designed for complex roof exhaust systems with certain system resistance - reliable power for demanding scenarios such as commercial kitchen fume extraction and laboratory exhaust gas discharge.

The core of the Centrifugal roof extractor fan is a centrifugal impeller installed within a vertical cylinder. Air enters through horizontal inlets around the fan base, gains energy under centrifugal force, and discharges vertically upward. This structure enables it to effectively counter external wind backflow, maintaining stable exhaust volume even in strong wind conditions - particularly important for high-rise building roofs. The casing is manufactured from aluzinc steel plate or stainless steel, with excellent weather and corrosion resistance, suitable for long-term outdoor exposure. The fan integrates gravity or electric weather dampers that automatically close when stopped, preventing rain and snow intrusion. Motors and transmission components are located in an independent maintenance compartment - maintenance personnel can perform inspection and upkeep without entering the air duct, safe and convenient. This design is especially practical in scenarios with heavy grease such as commercial kitchens - maintenance personnel do not contact greasy ducts. Every Centrifugal roof extractor fan from our factory undergoes full performance testing (airflow, pressure, power, noise) and rain sealing testing before shipping, ensuring products meet performance standards and do not leak in actual use. For exhaust systems requiring connection to fume purifiers, activated carbon adsorption boxes, or scrubber towers, this product's high static pressure characteristic ensures reliable gas conveyance to treatment equipment for compliant discharge.

• Centralized kitchen fume extraction systems in commercial complexes, hotels, and school canteens
• Fume hood exhaust in chemical, pharmaceutical, and electronics industry laboratories
• Organic waste gas discharge in auto painting and furniture spraying workshops
• Harmful gas treatment system exhaust in hospitals and biological laboratories
• Process exhaust in industrial plants requiring duct connection or purification equipment
• Terminal power for exhaust systems in underground structures and civil defense works

We support customization of centrifugal roof extractor fans based on customer system parameters. Customers provide exhaust airflow, system resistance (including duct, elbow, filter, purifier pressure drops), medium properties, roof opening size, and installation environment; we accordingly perform impeller selection, motor power matching, and casing size design. Casing material options include aluzinc steel, 304 stainless steel, or 316 stainless steel for different corrosion grades. Dampers can be gravity or electric type; electric dampers can be linked with the fan or integrated into building automation systems. Motor brand can be specified or recommended based on budget. Inlet/outlet flange standards can be machined to customer requirements. MOQ is one unit; mixed models allowed in one order. Customization lead time is 10–15 working days.

The company holds multiple national utility model patents including a fan blade detection device, a protective cooling air conditioning device, and a cooling airflow device - technical achievements directly applied in roof fan structural optimization and performance improvement. Product performance testing follows international standards AMCA 210 and ISO 5801, with test equipment regularly calibrated and data traceable. Motors are sourced from brands with CCC mandatory certification; CE certification documents are available for export. Electrical control cabinets are designed to IEC 61439 low-voltage switchgear standards. For projects with fire protection requirements, matching fire dampers can provide test reports meeting relevant fire safety standards. We maintain industry-university-research collaborations with multiple domestic universities and research institutes, continuously optimizing roof fan aerodynamic performance and rainproof structural design.

Centrifugal roof extractor fans are mostly used in critical scenarios such as kitchen fume extraction and waste gas treatment - substandard quality directly affects environmental compliance and user experience - so we enforce strict manufacturing quality control. Casing steel plate cutting uses CNC laser cutting; bending uses CNC bending machines, ensuring precise dimensions and tight joints. Welding is performed by certified welders; after welding, casings undergo kerosene leakage testing to verify sealing. Each impeller is dynamically balanced after assembly with accuracy no lower than Grade G6.3. After assembly, no-load trial runs verify rotation direction, current, vibration, and noise. Before shipping, every unit undergoes 100% rain sealing testing and performance spot-checking, then receives a conformity certificate and nameplate, accompanied by a user manual, installation diagram, and packing list. We welcome customer-designated third-party agencies such as SGS and BV for on-site factory inspection.

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