Fantech recommends that the dryer booster 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.
Sunday, June 30, 2013
How do Dryer Booster 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.
When is a dryer booster 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.
Should I run the fan after I have finished in the shower?
The Home Ventilating Institute (HVI) recommends running the fan for a minimum of 20 minutes after using the bathroom to completely exhaust moisture. Fantech offers a complete line of programmable and manual controls, switches and timers for your convenience. The FD60EM solid state 10,20,30,60 minute timer or Ventech Programmable switches (VT20M/VT20A) are just two examples of optional controls you can use.
What is Static Pressure?
Static Pressure is a measure of resistance to airflow as a fan pushes or pulls air through a duct. It is measured in inches of water gauge, such as 0.1” w.g. to show the resistance is equal to raising a column of water 0.1” or one-tenth of an inch.
How many bathrooms can I vent with one fan?
Fantech generally recommends that no more than 3 bathrooms be exhausted together. Whenever the fan runs, air will be exhausted from all the rooms that are connected to one system. This, in combination with the much higher cost of large fans, means that it is generally beneficial to exhaust a maximum of 3 smaller, or two larger, bathrooms together.
What installation tips can you give me to get the most from my Fantech Premium Bath fan?
Keep the duct runs as short as practical. (under 25 feet). The inner core of Flexible Insulated Ducting should be as tight and straight as possible and sealed to the grille housing/fan/wye connector/termination with aluminum foil tape. Ensure there is a minimum of 3 duct diameters between any fitting and the inlet/outlet of the fan. For the PB270-2 and PB370-2: It is better to have a short run of larger trunk line from the wye connector to the inlet of the fan and from the fan outlet to the termination point and longer runs of smaller duct from the grille/light to the wye connector.
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