This post ties in with the one from last week regarding a dryer booster fan making noise and the creative venting that caused it. The best way to get your dryer working as efficiently as possible is to ensure proper airflow, and proper airflow comes from short vent runs. And when I say short, I don’t mean actual length from dryer to outside, I mean equivalency. Let me explain.
As the dryer is pushing air through the ducting, it has a natural amount of resistance due to simply contact with the walls of the ducts. Add a bend and now the airflow begins to slow down more and add some more creative bends and the airflow begins to get really slow. As I have said before, air does not like to bend. So the more we force the air to bend on its journey to the outside, the more we are creating an environment for poor drying and a more likely duct that will need frequent cleaning.
The booster fan in this system was connected to a duct from the laundry room, then exited through a 180 degree bend, then immediately to a 90 degree bend. Now in talking distance, this is nothing more than about 3 feet. In talking equivalent distance, we are talking over 18 feet because of the bends. So by adding the booster fan, the installer removed 5 feet of equivalent ducting and installed over 18 feet of equivalent ducting. Sure the booster fan is a help, but it is helping where no help was needed.
The solution was actually quite simple. I remove the booster fan and put the ducting back the way it was before installation. The dryer will operate more efficiently and the homeowner will not need to worry about maintaining a dryer booster fan every year. Because shorter is always better.