The SHC and SHVC series square or rectangular cores are available as replacements on the SH/5SH, SHV/5SHV, SHR/5SHR, SHPC/5SHPC, and SHPCR/5SHPCR series diffusers. These are ideal for rental office spaces in which office layouts change with tenant requirements. Instead of replacing the entire diffuser, the core can be replaced without the need of changing the frame.