I have been recently working on my PEM following the instructions i have found on this site and via youtube. I have noticed a few things about the PEM and have a few ideas for reducing the amount of dirt within. 1) How about adding the (bucket) cyclone part of a dyson handheld vacuum cleaner between the fan and the pem? This would use the cyclones to reduce the size of the particles entering the PEM and allow easy empty of the bucket without reducing the air pressure. This is a dreamed up idea but someone with more ability than me might want to develop it. 2) Would there be benefit to removing the plastic mesh on the pem slots to allow leaves to fall out easier? 3) Has anyone considered putting the PEM on a hinge from the battery so that it can be cleaned in situ? 4) Have any water-cooled ideas been tried? maybe using a water-cooled CPU cooler or similar? Just some ideas to toss around.