Is the 10" thickness the minimum, or can it be trimmed down?

When installed as directed--with all components unaltered--the minimum thickness is 9 inches. However, as other have indicated, you can reduce this further by trimming the metal components of the duct. In fact, if you managed to glue/seal the fan housing directly to the plastic vent cap, the whole assembly requires only 5 inches. So there are a lot of options to put this unit in a thinner wall. If you trim the duct work, just be sure you have means to tape/seal everything once it is in the wall. On the final step, the length of the flexible duct is what enables you to tape/seal all the connections on the exterior side before compressing everything back into the wall.

Can this be left on 24 hours/day in a utility closet?

Indefinitely, I am not sure, but it does run here in 100 degree+ temps for most of the 24 hour day and has done so for about 4 years. If the temps are not too high it might be like one of those machines that if it runs all the time it will go until the bearings go out after a bunch of years.

Is it loud? Can you have a conversation In front of it?

It's not very loud, yes you could have a conversation near it. Had to do a small adjustment to free the fan, due to repacking from a previous customer.

Brand	Broan-NuTone
Colour	White
Electric fan design	Exhaust Fan
Power Source	Corded Electric
Style	Modern
Room Type	Laundry Room
Special Feature	Lightweight
Recommended Uses For Product	Exhausting, Ventilating
Noise Level	6 Sones
Wattage	25.4 Watts
Blade Length	6 Inches
Voltage	120
Switch Type	Remote
Item Weight	3 Pounds
Included Components	Cord
Manufacturer	Broan
UPC	882571985371 754262206587 026715067138 700811772560
Global Trade Identification Number	00026715067138
Item model number	512M
ASIN	B000LNKUN8

BROAN-NUTONE 512M

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