In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Non-linear energy attenuating material consisting of a plurality of loose particles is employed for impact energy dissipation. Furthermore, a result of the calculation is reported to a user. The list may then be used for a variety of purposes.