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You are here: Fantech USA | Ventilation Solutions

Fantech is a part of Systemair Group
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Dryer Exhaust

When is a dryer exhaust necessary?

According to some dryer installation instructions and local building codes, booster fans should be added in the dryer duct run when the length of duct exceeds 25 feet with no bends, 20 feet with one bend or 15 feet with 2 bends. With an existing system you may find that drying times are far longer than the dryer manufacturers instructions give, this may indicate that you have an duct run longer and more restrictive than your dryer can handle. Installing a Fantech dryer booster in the duct line will relieve the excess pressure in the duct allowing the dryer to operate as designed.

What is the maximum length of duct that can be used with a Fantech dryer exhaust fan?

The DBF 4XLDBF 4XLT and RVF 4XL (with DB10 pressure switch) are effective for up to 130 equivalent feet of 4” hard duct. The , is effective up to 108 equivalent feet of 4” hard duct. At these lengths the booster fans will maintain a velocity 1,200 feet per minute which will keep lint particles airborne guarding against build up in the duct.

How do I calculate my duct run?

To calculate the length of your planned duct run, measure from the dryer to the external venting point in the roof or wall. For each bend or elbow add 5-7 feet to your total duct run calculations (or as required by local codes).

How do dryer exhaust fans work?

When the dryer is on, the patented pressure switch senses positive pressure in the duct and turns on the booster fan for a pre-determined time, at the end of the timer cycle the switch checks for positive pressure in the duct, if there is pressure in the duct the cycle continues.

Where in the duct line can I install my Fantech exhaust fan?

Fantech recommends that the dryer exhauster be installed as close to the end of the duct run as possible with a minimum of 5 linear feet between the outlet of the dryer and the inlet of the fan.

Can the Fantech inline dryer exhaust fans be mounted horizontal?

As long as the air flow direction is correct and the pressure switch is vertical, the Fantech inline dryer booster fan can be mounted in any orientation.

I am adding a Fantech dryer exhast fan to my existing dryer duct line because my duct run is too long for my dryer to operate efficiently. Do I have to do anything special before I install the fan?

Ensure the duct is clean and free of lint build up, this may require the services of a professional duct cleaning company or chimney sweep. Otherwise on start up the fan may pull lint into the impeller blocking the airflow and stopping the fan.

What maintenance does my Fantech inline dryer booster fan require?

Since the fan bearings are sealed for life and provided with an internal lubricant no additional lubrication is necessary. Over time the fan impeller may accumulate lint. Periodic inspection, based upon dryer usage, should be performed to ensure the fan impeller is not obstructed or loaded with lint. Under normal conditions, the fan should be inspected every six (6) months. Note: Excessive booster fan noise or vibration may be an indication of lint buildup on the impeller. To inspect or clean the impeller: a. Disconnect the incoming power supply to the fan. b. Remove the duct from the inlet (dryer side) of the fan and remove any lint buildup on the impeller. At this time check for and remove any lint build up in the duct line before the fan. c. It is recommended that a connection such as a FC clamp be installed on the inlet of the fan to facilitate easy access for periodic inspection and cleaning. For the RVF 4XL wall mount fan, disconnect the power to the fan, remove the fan cover and clean the lint (if any) from the impeller reinstall the cover and apply power to the fan. e. After maintenance or cleaning check the operation of the fan.

How can I tell if my Fantech dryer exhaust fan is working?

With the dryer operating, open the dryer door. The fan on the dryer will stop but you should still hear air being pulled through the dryer from the booster fan. Fantech's DBF 4XLT features a wall-mount indicator panel that mounts in the wall near the dryer. An LED light on the indicator panel lets the user know that the fan is operating correctly.

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