The Dometic Air Distribution Box attaches to the A/C and equally distributes the air filling up your mobile living space with cool air. If roof thickness is greater than 4" then the Dometic Bolt Kit would need to be purchased.
Universal ADB US Item Name
3310742,014 Model on label
3310742.014 Scope of delivery
ADB,Installation Manual, installation materials Product Description
Universal ADB, Center Duct Wall Application