I recently had a Panasonic Whisper Series bath fan installed in my bathroom by a plumbing/HVAC company and wired up by a separate electrician. The fan starts up extremely slowly: it sounds like nothing is happening until 5-10 seconds after the switch is thrown, and it takes about 45 seconds to reach full speed.
Here is a video I made to demonstrate: https://youtu.be/X2nrfbXdfRU
Unfortunately, I don't know the exact model of the fan. The plumbing/HVAC people didn't tell me and didn't leave any manuals with me. It might have a FV-0510VSB1 motor assembly, as that model number is referenced on a the Spanish part warning sticker I can barely make out.
The electrician that hooked it up said that "all Panasonic fans are like that." Is that true? I'm skeptical because I can't imagine anyone would want a fan that works that way -- I thought it was broken the first time I tried it.
What's going on with my bath fan? Is there any way I can fix it to start up more quickly? Is there some kind of setting or could I hire another electrician to wire it up differently?