Panasonic FV11VQ5 exhaust fan

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goldstar

goldstar

Senior Member
Location
New Jersey
Occupation
Electrical Contractor
Have any of you used this Panasonic bath exhaust fan recently ? It has an internal switch allowing adjustment from 80-110 cfm. I installed one this past week and set it for 110 cfm. When I turn the wall switch on the fan takes about 10 seconds to come up to full speed. Yes, it's relatively quiet but my customer thinks there's a defect because she can't hear the fan come on for a few seconds. I asked my supply house about it and they tell me that it is normal because the fan motor is a DC motor. Sounds fishy to me. Anyone have any input on this ?

Thanks.
 
goldstar said:
Have any of you used this Panasonic bath exhaust fan recently ? It has an internal switch allowing adjustment from 80-110 cfm. I installed one this past week and set it for 110 cfm. When I turn the wall switch on the fan takes about 10 seconds to come up to full speed. Yes, it's relatively quiet but my customer thinks there's a defect because she can't hear the fan come on for a few seconds. I asked my supply house about it and they tell me that it is normal because the fan motor is a DC motor. Sounds fishy to me. Anyone have any input on this ?

Thanks.
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It is normal operation of the fan, I haven’t had any complaints though.
 
I've had the same thing on a couple of installs recently. Customers provided the fans, so not my problem anyway, but I made sure the exhaust was clear. Nature of the beast.
 
if possible, use Fantech FR inline series. your customers will think you ripped them off as they will have a hard time even hearing the fan run at full speed, they'll think you didnt install any fan at all ;)
 
GoldDigger said:
Is it possible that the long ramp time is actually controlled rather than just being a result of the torque curve of the motor?
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This from Panasonic " the DC motor speed shall automatically increase when the fan senses static pressure to maintain selected CFM "
 
FionaZuppa said:
if possible, use Fantech FR inline series. your customers will think you ripped them off as they will have a hard time even hearing the fan run at full speed, they'll think you didnt install any fan at all ;)
Click to expand...
That's what was in there originally. It was a 90 cfm fan that was vented into the attic. Wasn't doing the job. Everything in this house was a HO Special !!!
 
goldstar said:
That's what was in there originally. It was a 90 cfm fan that was vented into the attic. Wasn't doing the job. Everything in this house was a HO Special !!!
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Vented into the attic? Whaaaaaa? Thats not good. And you say not doing the job, as in 90cfm not enough airflow? Probably reason why not working right if it was venting into the attic. I love my FR fans, been workhorses for past 8yrs, and each sized correctly and vent to outside (approx 12ft of ducting on each). Can hardly hear them when on full speed, although i do not use the 2spd feature they have. btw, some of the noise generated in the room comes from the airflow over the grill and the exit hole in the grill case, so having the right air cover is essential. In washroom I replaced the old cheap fan box with a round 4" contoured air exit that has plastic flap on it (this seals off air when fan is not running) and installed FR in attic. Super quiet. In my bathrooms I simply removed the old fan box motor (cheap noisy crap), used those boxes as the grill & exit, and installed FR's in attic, still very quiet.
 
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