Originally Posted by
ChrisA Edwards
If you go with positive pressure, where would your air source be? Would you filter on both sides of the fan supplying the pressure?
In my head, it just seems that would be more likely to bring in dust/dirt particles than negative pressure.
I was concerned about the explosion issues when I built mine, but the fan was on the outside, blowing out my garage, so I took the chance that any slight ignition would be forced outside kind of like a jet engine.
Yes it was a risk, but I couldn't find any good extractor fans that were reasonably priced for my one time use. For a permanent fixture like yours, I would fit one or two belt driven fans.