PopAndSonGrows
Well-Known Member
I use a 4" to exhaust a 4x4 80" high, AND teed off to a 2x2 48" high, succesfully. It does a great job but it's at 100% speed all the time.
Reducing 6" ducting to 4"
- Thread starter westpoint
- Start date
I use a 4" to exhaust a 4x4 80" high, AND teed off to a 2x2 48" high, succesfully. It does a great job but it's at 100% speed all the time.
mtnman2016
Well-Known Member
If a fan tries to push 6" of airflow through a 4" reducer it will and I must exemplify the word will, reduce the life of the fan. It is proper physics. However, does a 6" fan really push the CFM to overfill a 4"? That can be debated.
Boatguy
Well-Known Member
Mine is dummed down to a 4" dryer vent.
It still works fine. 90's and other bends can be more restrictive than shrinking diameter, smooth wall tubing is best.