Being a dehumidifier and not an air purifier there is no need for a hepa filter, this has a normal dust filter which is easy to clean. If you are looking for cleaner air then an air purifier would be better which does have Hepa filters.
#2 What is the height of this dehumidifier and width?
The dimensions of this Dimplex dehumidifier are: Width 370mm x Depth 270mm x Height 505mm