The process
Powder booths recover overspray through cartridge filters with the extraction fan on the clean side, and the curing oven uses recirculation fans. Pretreatment tanks add fume extraction.
The gas at the fan
Ambient air carrying light dust from the surroundings, enough to settle on blades over months but not to erode them. Inlet screens and a wheel that sheds deposit are the usual precautions.
Selection for this duty
| Blade form | Backward inclined or backward curved; the residual dust does not justify a radial wheel |
| Material of construction | Mild steel |
| Drive and bearings | Direct coupled or belt driven; belt drive where the duty point may need tuning at site |
| Density at the fan | At about 35°C the gas density is close to 1.15 kg/m³, 95% of standard air. Pressure developed and power drawn fall in the same ratio, so the selection is made at this density and the motor is checked at cold start. |
A centrifugal impeller without a scroll, plugged through the wall of an oven, dryer or air handling unit so it recirculates the air inside the chamber. Belt driven or direct driven from outside the hot zone. Client-stated blade types for the Plug Fan in general: Backward curved.
Industries
Other fans in powder coating lines
Plug Fan in other processes
Heat Treatment FurnacesGlass Forming and Annealing LehrsCeramic Tunnel and Roller KilnsBelt and Tray DryersFood Ovens and FryersTextile Stenters and DryersAutomotive Paint Shops
Information needed to select or quote
- Duty point. Volume flow and static pressure at the fan inlet, with the gas density and temperature or the conditions to derive it.
- Operating conditions. Site altitude, normal operating temperature and continuous or intermittent duty.
- Gas stream. Dust loading and particle size, corrosive species, moisture, upset temperature and any tendency of the material to deposit on the impeller.
- Mechanical. Rotation viewed from the drive end, discharge orientation and motor power.