The document discusses different types of enclosures and cabinets used to house fire alarm system equipment. It describes CAB-4 series enclosures which include backboxes and doors to mount panels, modules, batteries and other equipment. It also describes EQ cabinets used for distributed amplifiers, power supplies and I/O modules. Battery backboxes like the BB-25, BB-55 and BB-100 are discussed which house batteries and chargers. Accessories for the NFS2-3030 control panel like chassis and decks are also mentioned.