The process
Dye houses are hot and humid, with steam and chemical vapour from the machines. Roof extractors and supply fans control the floor, fume extraction serves the chemical stores, and the boiler fan set serves the steam supply.
The gas at the fan
Air saturated with moisture from drying, with condensation on any cool surface. Drainage, a shaft seal and a material that tolerates wet running are part of the specification.
Selection for this duty
| Construction | Axial fans in weatherproof cowls, or supply and exhaust units with filters as the air quality requires |
| Density at the fan | At about 120°C the gas density is close to 0.90 kg/m³, 75% 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. |
An axial fan in a weatherproof cowl mounted on an inclined or flat roof, exhausting hot air from the ridge of a factory shed. Client-stated blade types for the Roof Extractor in general: Axial.
Industries
Other fans in dyeing and finishing houses
Roof Extractor in other processes
Induction Furnace Melt ShopsForge ShopsIron and Non-ferrous FoundriesWelding and Fabrication ShopsTyre Curing PressesShipyard Hull and Block FabricationGenerator and Engine RoomsCar Parks and TunnelsFactory Shed VentilationJute Mills
Information needed to select or quote
- Gas volume and temperature. Actual flow at the inlet, normal and upset temperature, moisture.
- Dust or pollutant. Inlet loading, particle size distribution, whether it is abrasive, sticky, hygroscopic or combustible; for gases, the species and concentration.
- Required outlet. The emission limit or clean gas concentration the unit must meet.
- Site. Available space and height, material of construction preferences, and how the collected material is to be discharged.