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.

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

SMART FLOW ECM MOTOR - Automatically adjusts airflow for optimal ventilation and energy savings
WHISPER QUIET OPERATION - Operates at just 0.9 sones, ensuring peaceful, distraction-free environments
ULTRA LOW PROFILE DESIGN - Slim 8.6 cm height fits tight ceiling spaces for versatile installation
PICK A FLOW SPEED SELECTOR - Customize your airflow between 50, 80, and 110 CFM with a simple switch
ENERGY STAR CERTIFIED EFFICIENCY - Consumes only 11.1 watts while delivering superior air movement and durability

The Panasonic FV-0510VS1 WhisperValue DC is a cutting-edge, energy-efficient bathroom ventilation fan featuring a smart ECM motor with SmartFlow technology that self-adjusts to maintain ideal airflow. Its Pick-A-Flow speed selector offers customizable ventilation at whisper-quiet noise levels (0.9 sones), all within an ultra-slim profile perfect for ceiling or wall mounting. ENERGY STAR certified, it delivers superior performance with minimal power consumption (11.1 watts), making it the go-to choice for modern, eco-conscious homes and multifamily buildings.

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Brand	Panasonic
Model Number	FV-0510VS1
Color	White
Product Dimensions	33.02 x 33.02 x 8.59 cm; 3.08 kg
Power / Wattage	11.1 watts
Voltage	120 Volts
Material	HAWA
Auto Shutoff	No
Number of Speeds	3
Noise Level	0.9 Sones
Special Features	Manual
Item Weight	3.08 Kilograms

Panasonic FV-0510VS1 WhisperValue DC Energy-Saving Bathroom Ventilation Fan, Quiet, Lowest Profile Energy Star Certified Ceiling Mount Fan

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