BTW, with storing i meant exactly that - storing it on shelve, not mounting - afterall, unused fan for half a year might have some issues with lubricant gone bad, no? (i'm just recalling reading somewhere that for sleeve bearing fans it's bad not only run it horizontally mounted, but also storing, which many big shops ignore though, just piling them on shelves however it seems simplier to them, so even bought new sleeve bearing fan might have issues with flown out or dried out lubricant oil after months on shelves).