| Non-conventional energy saving system |
Conventional energy system required. |
| No electricity bills. Cost of Ventilator is recovered in the first year itself. |
Electricity bills are a monthly feature. Increasing cost of electricity makes electrically operated-ventilator a costly proposition. |
| Not required heavy structures on roof. |
Heavy structures have to be mounted on the roof. |
| Vibration-free operation |
Roof becomes weak due to vibrations with Conventional ventilators |
| Assured operation for 24 hours a day, 365 days a year |
Can operate only when power supply is available & needed |
| No maintenance costs as there are not armatures / field coils/switches. |
Maintenance cost will be required |