How bad is it to have over 90 degree ducting???

Friend didn't really think things through. has some ducting that's over 90 degree angles...

well as long as when your odor control is hooked up right next the outake fan without having to travel long distances and around turns bfore filtering the air you should be fine.

As long as ur odor control system works properly the ducting sysem doesnt really matter even if it is 90 degree.

According to The Indoor Outdoor Medical Growers Bible. a 90 degree bend in your ducting reduces air transmission by 60%!

So yes, it very definately makes a difference.