Centrifugal Extractor Fan
Product Overview
A centrifugal extractor fan is specified where gas has to be pulled out of a relatively closed space, and there is duct resistance between that space and the discharge point. The centrifugal impeller generates negative pressure rather than relying on blade push, so it can draw effectively from a remote point or a space under slight negative pressure: a fume hood, a welding fume collection hood, or an exhaust system with a filter in line.
Core Advantages
Forward-curved multi-blade impeller for negative pressure. The forward-curved blade profile produces more negative pressure at the same speed than a backward-curved impeller, which suits extraction duty. This is what keeps capture velocity at the hood when several points are extracted at once.
Volute rolled from galvanised steel, standard flanges both ends. The casing is rolled galvanised steel, and flanges at both ends are made to standard duct dimensions so the unit connects to site ductwork without an adapter.
Motor external, isolated from the extracted gas. Corrosive gas or dust passes through the impeller and casing without reaching the motor windings, which is the difference on chemical and welding fume duty.
Static pressure 200–1,000 Pa at 300–12,000 m³/h. The band that covers extraction from a distant point or through a filter, where an axial fan would lose air volume.
Application Scenarios
• Downstream of laboratory fume hoods
• Welding fume collection systems
• Local exhaust at grinding benches
• Steam extraction in food processing shops
• Drawing waste gas from inside equipment or a closed space
Specifications
Standard configuration:
|
Parameter |
Range |
|
Air volume |
300 – 12,000 m³/h |
|
Static pressure |
200 – 1,000 Pa |
|
Motor power |
0.18 kW – 7.5 kW |
|
Rated voltage |
220 V / 380 V |
|
Impeller type |
Forward-curved multi-blade |
|
Volute material |
Galvanised steel / stainless steel |
|
Motor position |
External |
|
Inlet |
Standard duct flange |
|
Discharge direction |
Customisable |
|
Working temperature |
−20 °C to +80 °C |
Customised range (to be confirmed per project): discharge direction to site duct route; stainless steel volute for corrosive service; inlet control damper and flexible connector; explosion-proof or high-temperature motor.
Quality Control
The volute is braced internally for transport so it does not deform, and the motor is fixed separately. Packing is a wooden case. Because the motor is external, the shaft seal at the casing penetration is checked before packing, since this is where extracted gas could reach the motor side.
FAQ
Q: How does this differ from a centrifugal duct booster fan?
A: A booster fan is installed mid-duct to increase air velocity in the duct; an extractor fan is installed at the extraction point or at the duct end to generate negative pressure and pull gas from the source. Structurally, an extractor usually has a flow collector at the inlet, while a booster has standard flanges at both inlet and outlet.
Q: What material should be specified for extracting corrosive gas?
A: For slight corrosion, such as a small amount of moisture or weak acid, galvanised steel with anti-corrosion coating is sufficient. For acid or alkali vapour or organic solvent vapour, a stainless steel 304 volute with a stainless steel impeller is recommended. Strong corrosion needs stainless steel 316L or FRP.
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