FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
System to generate electrical energy through ventilator
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
More Sachin Vasant from Engineering Lab, CG Global R&D Centre, Kanjurmarg (East), Mumbai 400042, Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
This invention relates to ventilation systems and energy systems.
Particularly, this invention relates to energy systems for harnessing energy through ventilation systems.
Still particularly, this invention relates to a energy harnessing ventilation system,
BACKGROUND OF THE INVENTION
Manufacturing buildings typically have exhaust vents mounted on the sides or roofs through which exhaust gas, dust and smoke produced by machinery located inside the building is expelled into the outside atmosphere. Large blowers on the machinery located in the building force exhaust gas, dust and smoke outward through intervening duct works and exhaust vents. In order for the large blowers to operate efficiently, it is important that the correct size and shape of the ducts and exhaust vents be used to prevent excess back pressure.
Typically, these blowers / ventilators have blades which rotate as the exhaust gases escape through them. While the exhaust gases propel the rotation of the blades, the blades are propelled due to outside wind, or electrical energy in some cases, and further accentuated by the exhaust gases themselves.
In many manufacturing buildings, the large blowers on machinery operate 24 hrs a day and 7 days a week, without any external power supply. An electric generation apparatus the enable owners or tenants to recover the

energy from the exhaust gas and does not generate excessive back flow-pressure that may damage the blowers would be highly desirable.
PRIOR ART
United States Patent Application 6365985 describes an electricity generator powered by air conditioner exhaust having a wind turbine and a bracket to hold the wind turbine in a relatively fixed position, to an air conditioner exhaust.
Indian Patent Application 997/MUM/2008 describes a new method of recovery of wind energy and system thereof and which utilizes out coming air flow from one or more ventilation systems of a bounded area such as but not limited to. an underground mine, a tunnel or some other industries requiring ventilation.
However, both the above applications require external feed, and there is a need for an integrated compact self-sufficient and cheap assembly for harnessing available power and for generating electricity.
OBJECTS OF INVENTION
An object of the invention is to provide an apparatus and arrangement to generate power from ventilators.
Another object of the invention to provide Ventilator with environment friendly and low cost in nature

Another objective of the invention to provide a system for generating electrical energy through use of ventilator and exhaust air
SUMMARY OF THE INVENTION
According to this invention, there is provided an energy harnessing ventilation system adapted to harness energy from working of a ventilator, said system comprises:
a. ventilator fins adapted to rotate about an axis, for gas exhaust;
b. magnetic ring co-axially located, in a fixed manner, within said
fins and adapted to generate back EMF and potential difference
due to said ventilator fins cutting magnetic field of said magnetic
ring; and
c. stator co-axially located, in a fixed manner, within said magnetic
ring and adapted to converted said generated potential difference
into electricity.
Typically, said system includes an energy storage means adapted to store said generated electricity.
Typically, said system includes an end fixture adapted to hold said ventilator fins, said magnetic ring, and said stator in a compact manner.
Typically, said system includes a shaft adapted to co-axially locate said fins, said magnetic ring, said wound stator, and said end fixture.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic of the isometric view of the energy harnessing ventilation system; and
Figure 2 illustrates a schematic of the exploded view of the energy harnessing ventilation system.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
According to this invention, there is provided an energy harnessing ventilation system.
Figure 1 illustrates a schematic of the isometric view of the energy harnessing ventilation system (100); and Figure 2 illustrates a schematic of the exploded view of the energy harnessing ventilation system.
In accordance with an embodiment of this invention, there is provided a ventilator system with a plurality of fins (10) adapted to exhaust gases meant for exhaustion in a typical set-up. Typically, said ventilator systems are mounted on the sides or top of a building. The fins are aligned such that the blow of air at the locations of installation propels the ventilator system to work by rotation of the fins. Typically, said fins are radially dispersed.

In accordance with another embodiment of this invention, there is provided a magnetic ring (12) adapted to be co-axially located with said ventilator system. Typically, the magnetic ring is placed within the inner circumference and gap between said plurality of fins, such that as the fins move, the magnetic field is cut to generate back EMF (Electro Motive Force), which in turns generate potential difference.
In accordance with yet another embodiment of this invention, there is provided a wound stator (14) adapted to be co-axially located within said fins and said magnetic ring. The potential difference generated is harnessed by said stator to convert to electricity. This electricity may be stored in a battery or used directly.
In accordance with still another embodiment of this invention, there is provided an end housing fixture (16) adapted to hold said fins, said magnetic ring, and said wound stator in a compact arrangement.
In accordance with an additional embodiment of this invention, there is provided a shaft (18) adapted to co-axially locate said fins, said magnetic ring, said wound stator, and said end fixture. The shaft fits through said embodiments and forms its compact arrangement.
This apparatus and arrangement results into an environment friendly, low cost, power generating ventilating system.
This invention is cost effective and easy to manufacture, assemble and provides an easy means of power generation by ventilation, which is environment friendly and can be considered as a natural source of power.

We claim,
1. An energy harnessing ventilation system adapted to harness energy
from working of a ventilator, said system comprising:
a. ventilator fins adapted to rotate about an axis, for gas exhaust;
b. magnetic ring co-axially located, in a fixed manner, within said
fins and adapted to generate back EMF and potential difference
due to said ventilator fins cutting magnetic field of said magnetic
ring; and
c. stator co-axially located, in a fixed manner, within said magnetic
ring and adapted to converted said generated potential difference
into electricity.
2. A system as claimed in claim 1 wherein, said system includes an energy storage means adapted to store said generated electricity.
3. A system as claimed in claim 1 wherein, said system includes an end fixture adapted to hold said ventilator fins, said magnetic ring, and said stator in a compact manner.
4. A system as claimed in claim 1 wherein, said system includes a shaft adapted to co-axially locate said fins, said magnetic ring, said wound stator, and said end fixture.