sunleaves windunntel life expectancy?

sooo, does anyone have ay idea on a sunleaves windtunnel life expectancy? ive been running mines for almost 3 years now, im thinking of buying and installing a new one, just in case it shorts out and my plants get fried while im not home, but the one i got is still working fine.
anyone got any experience with this blue plastic fan?

I had bought one a while back a 4 in 400cfm one and it by far is still the best fan I have bought. I don't have it anymore due to other reasons but it was the most powerful and quietest for its size. I had it for a while before i lent it to a friend who dropped it.

No shops around me stock them so I don't end up going with the wind tunnel anymore although I would like to try a bigger one. Might just order one.