Gas filtration system

1. A filtration system for removing a particulate material from an air stream, comprising:

a housing having an internally formed air path communicating between an inlet for incoming polluted air containing particulate material and an air outlet for emitting clean air filtered by removing the particulate material;

a filter media collection system provided in the air stream to collect the particulate material, said collection system including at least one spool of filter media;

a filter media cleaning system provided to clean the collected particulate material from the filter media; and

a drive system for actuating and controlling the filter media collection system;

wherein the filter media collection system includes a drum and a filter media moved over a surface of the drum by the drive system;

wherein the filter media includes a first filter media spool and a second filter media spool, the filter media being spooled between the first and the second filter media spools;

wherein the drive system causes rotation of at least one of the first and second filter media spools to move the filter media over the drum in a first direction and the drive system causes rotation of the other of the first and second filter media spools in an opposing direction to move the filter media over the drum in a second direction.

2. The filtration system according to claim 1 , wherein the drum includes a static, perforated drum.

3. The filtration system according to claim 1 , wherein the filter media cleaning system comprises means for removing accumulated material on the filter media.

4. The filtration system according to claim 3 , wherein the filter media cleaning system comprises a vacuum.

5. The filtration system according to claim 3 , wherein the filter media cleaning system comprises a brush.

6. A filtration method for removing a particulate material from an air stream, comprising:

passing an air stream through an inlet to a housing having an internally formed air path communication between the inlet and an air outlet;

providing a filter media collection system in the air stream and collecting particulate material in the air stream, the collection system including a drum and at least one spool of a filter media; and

providing a filter media cleaning system and cleaning the collected particulate material from the filter media;

wherein said collecting step comprises moving the filter media over a surface of the drum in a first direction;

wherein the at least one spool of filter media includes a first filter media spool and a second filter media spool, and moving the filter media over the surface of the drum includes the filter media being spooled between the first and the second filter media spools; and further comprising:

rotating at least one of the first and second filter media spools in a clockwise direction, the filter media moving in a first direction to spool onto the at least one of the first and second filter media spools; and

rotating an other of the at least one first and second filter media spools in a counter-clockwise direction, the filter media moving in a second direction to spool onto the other of the at least one first and second filter media spools.