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The RSIC-1 EXT04 is designed for use where an additional drop for HVAC, Plumbing, or Electrical Chases is needed. This clip gives you the flexibility to drop a ceiling as much as 4″ from its original height. This clip has proven to be very popular with the Home Theater industry.
-Used to level out uneven floor joists
-It creates a dropped ceiling, allowing an open chase for the new wires, all while retaining the superior acoustical performance of the RSIC clips