Thanks for the replies Tam/Andrew.
Powertool wrote
Normally when it is warm,I leave the workshop door open
Andrew this is the main problem with my workshop,it does get very,very warm in there in the summer months.Even today it's been quite cool outside,but it is warm in the ws.
So with the doors windows open won't you just be drawing air in from outside :?:
Or with the doors windows open be enough to circulate the air without the use of a filter:?:
Paul.J.