Fire-Rated Back Box for AEC65 Ceiling Speaker - Gray, UPC: 07847749867
Can be mounted in suspended-ceilings
In order to provide sufficient depth for loudspeakers, drywall must be 5/8" (16mm) or thicker
Ceiling joists must be a minimum of 2" x 6" (50mm x 153 mm) in size.
Metal with fiber glass inside