314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan Outlets.
STEEL CITY 0-Gang Ceiling fan Electrical Box Mounting Bracket 54151CFB-OW | RONA
Can this electrical box hold a 23lb ceiling fan? : r/askanelectrician
NUTEK Round airtight ceiling box with side bracket | The Home Depot Canada
926 Ceiling Fan Box w/Brace, 1-1/2-inch Deep Octagon box, for Ne.-Ceiling fan brace-Ceiling fan support-Ceiling fan box-Ceiling fan mounting - Walmart.com
Hubbell-Bell PRCF57550GY Ceiling Fan Electrical Box, Gray, 4 in. : Amazon.ca: Tools & Home Improvement
Ceiling Fan Outlet Box, 20-Cu. In Capacity -B720R-SHK | Walmart Canada