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How do I size my Fantech bathroom exhaust system?
HVI, the Home Ventilation Institute recommends that the fan be sized for 8 air changes per hour:
A. Calculate the volume of the bathroom in cubic feet.
B. Multiply the volume by 8 to get ventilation rate in cubic feet per hour.
C. Divide by 60 to get volume in air ventilation rate per minute in cfm.
D. Look in the Performance Data under 0.4" of back pressure for most installations to pick a fan with the required power.
How do I ensure that my Fantech system will be as quiet as you claim it can be?
A. Use insulated flexible duct. It has excellent noise canceling properties and minimizes condensation.
B. Install the fan as far away from the exhaust grille as possible. Fantech recommends a minimum of 8' of flexible duct between the fan and any exhaust grill.
C. Install multiple exhaust points when large volumes of air is to be exhausted. When more than 150 cfm is exhausted through one HG 6 exhaust grill noise may be generated in the grill. Install multiple grills close to the sources of moisture in order to minimize noise and get the most effective ventilation.
D. If rigid duct has to be used: Install a LD sound attenuator next to the inlet of the fan.
How many bathrooms can I vent with 1 (one) fan?
Fantech generally recommends that no more than 3 bathrooms are 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 2 larger, bathrooms together.
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