Amazon.com: OHLECTRIC Saf-T-Brace For Ceiling Fans - Features 3 Teeth, Twist and Lock Design, 1.5" Heavy Duty Metal Electrical Box - Secure Installation For New, Remodel, Retrofit Application, Silver - OL-39193 :
RACO 1-Gang Gray Metal Old Work Ceiling Fan Ceiling Electrical Box in the Electrical Boxes department at Lowes.com
BELL PRCF57550BZ Ceiling Fan Electrical Box, Bronze, 4.75 in. - Amazon.com
Westinghouse F1100 Support Brace For Ceiling Fans Fits 16 Inch to 24 Inch Ceiling Joists | Energy Avenue
Reiker Super Fan Brace Heavy-Duty Brace Support System, Ceiling Fan Brace | eBay
Arlington FBRS415-1 Steel Fan and Fixture Mounting Box with Adjustable Mounting Bracket, For New Construction, 16-24-inches, Metallic, 1-Pack - Electrical Boxes - Amazon.com
RACO 1-Gang Steel New Work Standard Ceiling Fan Electrical Box, Gray
Westinghouse Saf-T-Brace® 0152511 Heavy Duty Ceiling Fan Support Brace, 1-1/2 in D | State Electric
Ceiling Fan Installation, Step by Step
Arlington FBRS4200R Heavy Duty Fan/Fixture Mounting Box With Knockout, Adjustable Mounting Bracket, Steel, 20 cu-in Capacity, 4 Knockouts, 3.563 in L x 13.979 in W x 3.438 in H | State Electric