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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Panasonic FV-0510VS1 Whispervalue Dc Fan

Panasonic FV-0510VS1 Whispervalue Dc Fan

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.

Product ID: 52996842

Details

Brand
Panasonic
Color
White
Electric fan design
Exhaust Fan
Mounting Type
Ceiling Mount
Power Source
Corded
Product Dimensions
16.29"D x x

⚡11.1W energy-efficient DC motor

💨100 CFM airflow

🔇0.9 sones ultra-quiet

€ 370.09

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Description

💨 Quiet power, smart airflow — breathe better, live smarter.

WHISPER QUIET OPERATION - Experience near-silent performance at just 0.9 sones—ventilation that won’t interrupt your focus or relaxation.
SLEEK SPACE SMART DESIGN - Compact 3-3/8 inch housing depth and L-shaped mounting bracket fit seamlessly into any ceiling space.
CUSTOMIZABLE AIRFLOW CONTROL - Pick your perfect breeze with 3-speed airflow selector (50, 80, 100 CFM) for tailored ventilation.
TRUSTED DURABILITY WARRANTY - Backed by Panasonic’s 6-year motor warranty, ensuring long-lasting, worry-free ventilation.
ENERGY STAR CERTIFIED EFFICIENCY - Save on energy bills with a powerful yet low-wattage 11.1W DC motor designed for sustainable living.

The Panasonic FV-0510VS1 WhisperValue DC Fan delivers customizable ventilation with three airflow speeds up to 100 CFM, ultra-quiet operation at 0.9 sones, and energy-efficient 11.1W DC motor. Its compact design and easy installation make it ideal for bathrooms and living spaces, backed by a 6-year motor warranty for reliable performance.

Specifications

ASIN	B06W2LB17J
Air Flow Capacity	100 cfm
Best Sellers Rank	#11,971 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #25 in Household Ventilation Fans
Blade Length	7.09 inches
Blade Material	Plastic
Brand Name	Panasonic
Collection Name	Bathroom
Color	White
Control Method	App
Controller Type	Switch
Customer Reviews	4.6 4.6 out of 5 stars (1,638)
Electric Fan Design	Exhaust Fan
Finish Type	Aluminum
Global Trade Identification Number	00885170306295
Included Components	Ventilation Fan unit, grille, Flexi-Fast bracket, intallation manual, warranty sheet, self-drilling screws (4)
Indoor Outdoor Usage	Indoor
Installation Type	Multi-Mount
Item Dimensions D x W x H	16.29"D x 11.49"W x 14.2"H
Item Type Name	Ventilation Fan
Item Weight	6.8 pounds
Manufacturer	Panasonic
Material	Metal
Model Name	WhisperValue DC fan
Model Number	FV-0510VS1
Motor Type	DC
Mounting Type	Ceiling Mount
Noise Level	0.9 sones
Number of Packs	1
Number of Power Levels	3
Number of Speeds	3
Part Number	FV-0510VS1
Power Source	Corded Electric
Recommended Uses For Product	Exhausting, Ventilating
Room Type	Bathroom, Garage, Living Room, Laundry Rooms
Size	Medium
Special Features	Manual
Specification Met	Energy Star
Speed	100 cfm
Style	Standard Fan
Switch Type	airflow selector switch
UPC	885170306295
Unit Count	1 Count
Voltage	120 volts
Warranty Description	6 year warranty on motor
Wattage	11.1 watts

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