will my videos be destroyed in a storage building.?

it depends on what kind of videos u r storing. didnt u read the warranty of wat was covered due to heat or water damage? tapes can only take up to a certain amount of heat. there shouldnt be no heating ducts in the storing unit. if there is, u should go to the company and ask for a copy of the warranty and see wat the tapes are covered under, if not, go in ur storage room and take those bad boys out immediately.

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Yes they can be ruined in a hot building.

absolutely! DO NOT PUT THEM IN THERE!