Sure, you can add an exhaust fan to increase the draw from the gravity discharge dryer exhaust and overcome the friction from the 90 degree bends, but be well advised that the felt and lint can create a flammable mixture, so use a fire protection exhaustion system
: I have a very long dysfunctional dryer vent(too long and too many 90degree turns). I can vent into the garage but dont want the dust and humidity on the cars,tools etc. There is no good way to vent to outside, are there any other option.?