push of pull the air through a fume extractor?

[Doug Kircher]

Most setups I see, pull it through.....any particular reason for this besides being able to create a negative pressure in the carbon filter container?

[john banks]

Consider leaks in areas of positive pressure.

[ray hampton]

placing the filter between the motor and the source of fumes keep the motor clean

[Randy Digby]

What they said.