Like Roger, I use a 3M Airmate (now out of production but replaced by similar, very expensive models). Good face and respiratory protection (HEPA rated). When the fan motor crapped out I found a replacement power module on Ebay for about $50 including battery and filter, and noted deals of similar value on complete units. Definitely worth a search. Mine has the belt mounted power unit so the helmet and faceshield are lighter than the Trend type.