These are similar to shop vacs, but are designed for the removal of ash materials.
Spray-and-vac systems first became popular for restroom cleaning.
The hand vac has a rotating brush for cleanup on stairs and furniture, plus a hose for hard to reach spots.
Only a wet vac is suitable for this purpose.
For maintenance (daily cleaning) it is best to use an ash vac.
Optionally, many manufacturers sell adapters to connect a shop-vac in lieu of a bag to capture more of the dust and simplify disposal.
These vacs are available with a pellet stove kit which enables the cleaning of the interior areas of the stove which improves efficiency.
Hi-vac mowers have a tunnel that extends from the side discharge to the bag.