What is the sound (scone) level of this fan?

I believe it operates at .9 @110cfm .6 @80 cfm .4 @50cfm. It's advertised as <.3 scone which is true if measured off of the start up speed. Since it is a DC motor it has what would be noticed as a slow start but that is totally normal. They have a larger unit also that has a light with a 6" exhaust and it tops out at 150cfm and it is maybe a little above 1 scone at full speed. These are in opinion hands down the best residential bathroom/utility room exhaust fans. I don't even offer anything else to my customers. You won't be disappointed.

What is the duct size please?

It is 4 in oval so it can fit into 2 by 4 walls. I used this to immediately go to the outside. Fantech 4 inch Round to Oval Duct Elbow FEL 4 https://www.amazon.com/dp/B004HE1A7C/ref=cm_sw_r_cp_apip_ZR9i4rM5GZFhA

Can this fan be installed from below, or do you need to access from above ceiling?

Yes. If you can get the knockout out and enough vent tube down. Not your hole will need to be about 1/2” bigger than the fan to accomplish this and you will need to be in a stub/joist

The fan turns on but its not a constant speed/whir and it oscillates between on and off - is that how its supposed to work?

You've probably solved your problem by now, but for future purchasers reading these questions, this issue appears to be caused by certain timers that are not compatible with the unit. It should operate at constant speed. Mine shows up today so haven't tested yet, but I read that the Legrand RT2WCCV4 timer works fine.

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Q: What is the duct size please?

It is 4 in oval so it can fit into 2 by 4 walls. I used this to immediately go to the outside. Fantech 4 inch Round to Oval Duct Elbow FEL 4 https://www.amazon.com/dp/B004HE1A7C/ref=cm_sw_r_cp_apip_ZR9i4rM5GZFhA

Q: Can this fan be installed from below, or do you need to access from above ceiling?

Yes. If you can get the knockout out and enough vent tube down. Not your hole will need to be about 1/2” bigger than the fan to accomplish this and you will need to be in a stub/joist

Q: The fan turns on but its not a constant speed/whir and it oscillates between on and off - is that how its supposed to work?

You've probably solved your problem by now, but for future purchasers reading these questions, this issue appears to be caused by certain timers that are not compatible with the unit. It should operate at constant speed. Mine shows up today so haven't tested yet, but I read that the Legrand RT2WCCV4 timer works fine.

Brand	Panasonic
Color	White
Electric fan design	Exhaust Fan
Power Source	Corded Electric
Style	Modern
Product Dimensions	16.29"D x 11.49"W x 14.2"H
Room Type	Bathroom, Garage, Living Room, Laundry Rooms
Special Feature	Manual
Recommended Uses For Product	Exhausting, Ventilating
Noise Level	1.3 Sones
Wattage	11.1 watts
Air Flow Capacity	100 Cubic Feet Per Minute
Blade Length	7.09 Inches
Voltage	120 Volts
Collection Name	Bathroom
Switch Type	‎airflow selector switch
Item Weight	6.8 Pounds
Indoor/Outdoor Usage	Indoor
Model Name	FV-0510VS1
Specification Met	Energy Star
Control Method	App
Blade Material	Plastic
Is Cordless?	No
Number of Power Levels	3
Manufacturer	Panasonic
UPC	885170306295
Global Trade Identification Number	00885170306295
Part Number	FV-0510VS1
Item Weight	6.8 pounds
Country of Origin	Mexico
Item model number	FV-0510VS1
Is Discontinued By Manufacturer	No
Shape	Square
Item Package Quantity	1
Number Of Pieces	1
Special Features	Manual
Batteries Included?	No
Batteries Required?	No
Warranty Description	6 year warranty on motor

Panasonic WhisperValue Ceiling/Wall Mount Bathroom Exhaust Fan, 50-80-100 CFM, FV-0510VS1

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