Panasonic WhisperGreen fans - explain how they work!

piscesgirlJuly 17, 2014

We purchased a Panasonic Whisper Ceilling fan with Lutron fan timer switch for our master bath remodel. Currently planning the guest bathroom remodel and have been looking at the WhisperGreen fans since they have DC motors and are more energy efficient.
Does anyone have one of these fans? I am curious as to how they work? My understanding is that they have two control settings on the fan. One which determines the CFM which the fan will constantly run at and another which is a timer that determines how long the fan will run at full strength when "turned on or triggered" Depending on the model it is either "turned on" by a traditional switch or by a motion sensor for the models with this feature. Am I correct so far?

We don't want the sensor model, as this is for a guest bathroom and we don't need the fan turning on full speed every time I walk in the room...even if it is just to stock toilet paper! So I am looking at the basic non-sensor model, but I am a bit confused how they work. So when a person enters the room and flips the switch on (up) the fan will run at full speed for the time designated on the timer. I get that. What happens if when the guest flips the switch off (down), which I assume they would do since they don't know it is on a timer, will nothing happen and the fan continue to run out the length on timer? What happens if the guest doesn't flip the switch off (down), will the next guest need to flip the switch off (down) to turn on the fan since the previous user last left the switch in the "on" or up position?

With the fan being so quiet I am concerned it may be hard for a guest to determine if it is on or off. Am I missing something in regards to how these fans work?

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Some of the fans are simple on/off fans controlled by a switch. But the fans do have a constant CFM feature. ie, if your wall damper is stuck partially open, the fan will run at a higher RPM to move the same amount of air if the vent had no obstruction at all.

The next level up of fans can run full time at a low baseline CFM to constantly move a small volume of air. That baseline can also be set to "zero", which essentially turns the fan OFF. When the switch is actuated ON, the fan then ramps up from the baseline setting to a higher moisture removal CFM rating. It stays at that higher rating while the switch is in the ON position. When the switch is moved to the OFF position, it continues to run on the high CFM setting for a specified amount of time, then the fan ramps back down to the lower CFM setting. Or the fan turns OFF is the lower constant run setting is set to ZERO.

I actually prefer the shower fan and shower light to be on the same switch. When the shower light is turned on both the light and the fan turn on. When the shower light is turned off, the light turns off but the fan continues to run for a set amount of time.

Hope that makes sense. That is my understanding of the fans.

    Bookmark   July 17, 2014 at 4:28PM
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Thanks mongoct. Based on your explaination it sounds like it works the way I thought it did.

We weren't originally planning on having a separate light switch for the shower light but I guess that is something we should think about. It would avoid the complicated situation where the fan switch could be up or down/ on or off at any point in time....and someone having to hit two switches versus one.

The only issue is if someone wants to use the toilet and turn on the fan, then they are also turning on the shower light. I guess that isn't a huge deal since it is a guest bathroom.

    Bookmark   July 18, 2014 at 10:21AM
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