Can use of smcFanControl all the time be destructive to my macbook pro?

Hello forum,
I grilled my hands on my MacBook pro for over a year now till I found this lovely small application called smcFanControl. This app really keeps the temperature of the surface of the keyboard low only if the fan power is >50-60% all the time.
Now my question is if it is harmful to the fan if it's working all the time? or is there any limit for that? like say higher than 90%?
Thank you,
Stan

I would just like to chime in here and vouch that these fan control apps will make a difference when graphics or video ecoding (Handbrake) for example.
Then there is the other side of the hill, where encoding and CPU is normal for that high temp because you wouldn't expect video to encode at a cool would you.
Then again, while these apps do their job, be careful, as "forcing" the speed to to stay cool may genate more heat as fans spin up to reduce to cool it down. Thats my understand anyway. Based on that i'd prefer to just use iStat to monitor, not control which control.
I mean, the temps rise for a reason when encoding/ graphics intensive use. Your basically asking the machine to take it it its limits, which may work fine, but its probably on the boarder line.
Also, just for the record, its not only Apple that has sensors that prevents overheating.. Most Intel chips do and shutdown when heat is above and beyond.
Just out of curiousity, what is the max. fan temps on the MBP ? I know it was 6200rpm on the 13"

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