Explosion proof Extractor Fan.
Extractor fans are required in hazardous areas such as offshore oil and gas platforms and refineries for use in enclosures containing a source of hazard such as cabins, containers, stores and battery rooms.
The airflow rate will normally be in the range of 10 to 20 air changes per hour.
Extractor fans are more effective in maintaining a safe environment if they are used in conjuction with a supply fan unit.
Suitable for use in:
- Class 1 division 1 Group CD hazardous areas
- Zone 1 IIB hazardous areas
To install the fan:
- Cut a circular hole in the wall, 20mm diameter larger than the nominal fan diameter.
- Cut a square hole in the wall, width and height of hole 20mm more than the nominal fan diameter.
- The fan plate is fixed directly to the wall with screws or bolts.
- Fans are normally installed with the motor pointing into the room.
- Precautions must be taken to ensure that personnel cannot be injured by the rotating impeller.
Fans can be supplied for group B, C, D gases but the motor design and installation details are different.
Motors can be supplied for most electrical supplies (single and three phase). The current rating is less than 1 amp.
Specification:
- For offshore applications units are fabricated of 3mm type 316 stainless steel of self finish.
- For onshore applications such as refineries and chemical plants, units are fabricated either of 2 mm type 304 stainless steel of self finish or of 2mm electrogalvanised mild steel with a 2 coat epoxy finish.
- Fans can be provided for most electrical supplies and either for class 1 Div 1 CD areas or for Class 1 Div 1 BCD areas.
- Fan motors are certified to CENELEC standards.
EF1 Extractor Fan Performance
| Fan diameter (mm) | 150 | 160 | 170 | 180 | 190 | 200 |
| Air flow with 15 degree blade angle(m3/s) | .023 | 0.37 | 0.52 | 0.76 | 0.12 | 0.16 |
| Noise level at 1 metre (dBA) | 58 | 60 | 62 | 64 | 67 | 72 |
Notes:
Increasing the blade angle from 15 degrees to 40 degrees blade angle will have the following effects:
- Approximately double the airflow for a constant fan static pressure.
- Increase the noise level by about 10 dBA for a constant static pressure.
Measurements of performance were made on fans operating in free air without connecting ducting. Installation of non-return dampers, louvres, ducting and other system factors may reduce the above airflows and effect the noise levels.
These are our standard designs, variations can be supplied.
Designs are subject to improvement.
