DBF4XL Metal Dryer Booster
Why do you need a dryer booster fan? According to some dryer installation instructions and local building codes, booster fans should be added in the dryer duct run when the length of the duct exceeds 25 feet with no bends, 20 feet with one bend or 15 feet with two bends. Air is very lazy. It doesn't like rough surfaces, and it doesn't like to turn corners. It considers such things "resistance", and as it drags over and around such impediments, it slows down. The more resistance it encounters on the way out of the building, the more it slows down and the poorer the performance of the dryer.
You might think your dryer needs to be replaced because it takes a couple of cycles to dry the clothes when it might be that your ducting is the culprit. Take a look at it. Is it crushed up against the wall where it comes out of the dryer? Are there 90° bends? (For each 90° add 7 feet to the overall length.) And the cap at the end? That is at least another 90° bend, especially if it has one of those little aluminum flaps on it. Is the hood bent? Is the damper stuck open (or even worse, closed)?
This booster system has all the parts necessary to install it in the line including Fantech's patented pressure switch which automatically turns the fan on when the dryer pushes air into the ducting. NOTE: if the boost fan is located within 15 feet of the dryer, a DBLT4 Lint Trap should be added between the dryer and the fan. This will lengthen the fans life by keeping the worst of the lint out of the fan.
