The Trion Air Bear Grill Mount 2000 air cleaner is a whole house grill mount air cleaner. It is typically located on the ceiling or wall of a home or office. Behind the grill is a disposable 20 x 25 x 5 air filter. The filter for the Trion Air Bear Grill Mount 2000 needs replaced twice per year for users with heating and air conditioning and once per year for heating only applications.