The Shop vac Ash Vac…. The quality of the Ash Vac is directly linked to the quality of the filtration in the machine. When you use a Shop Vac Ash Vac you can be sure that the Ash stays inside the Vac and does not escape into the room. With its HEPA cartridge filter that is 99.97% efficient to 0.3 microns you can be sure that with the Shop Vac Ash Vac that no dust is sent into the air in the vicinity of the fire place or barbeque. For cold ashes only this is a high quality machine that is perfect for coal fires, log fires, wood burning stoves, barbeque grills, fire pits etc.