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

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.
 
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.
 
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