What is a slip joint and what is it used for?

• A. It is a fixed joint that cannot be separated without cutting.
• B. It allows two duct sections to slide together for alignment or disassembly; typically sealed with tape or mastic.
• C. It is used only for temporary ventilation ducts and must be resealed after every use.
• D. It is a flanged connection requiring bolts for assembly.

Answer: (B)