Commercial Electric 4 in. Round 1-1/2 in. Deep 15.3 cu. in. Metallic Ceiling Fan/Light Fixture Box and Brace Kit for New Work CMB150-NB - The Home Depot
Westinghouse 15.5 cu. in. Retrofit Ceiling Fan Saf-T-Brace 0110000 - The Home Depot
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Ceiling Fan Installation, Step by Step
Hubbell Raco 936 4 in. Round Retro-Brace Ceiling Fan-Rated Support, 4 in, Gray - Electrical Boxes - Amazon.com
How to Install a Ceiling Fan Mounting Bracket — The Family Handyman
electrical - Mounting Ceiling fan in 1940s built home - Home Improvement Stack Exchange
How To Install A Ceiling Fan: 7 Simple Steps (DIY Guide)
RACO Ceiling Fan Box with Brace Installation - YouTube