I own a few air purifiers that I keep in the busiest areas of the house, but I'll admit I don't change their ... you have to purchase the remote control separately from Shark.

Shark says owners should remove the HEPA filter and vacuum the interior to remove any dust or debris every two months. The HEPA filter itself is not washable and should never come in contact with ...

There is a remote control ... Here are the stats: the Shark NeverChange 5 can clean rooms up to 60 square metres (think a large-ish lounge), with a single complete change of air every hour.