The Broilmaster 16-Inch Power Side Burner Insulated Sleeve (BSASL16) is required when installing the BSABW16N Power Side Burner into a combustible outdoor kitchen island structure. Given the Power Side Burner's 60,000 BTU output, proper thermal isolation is especially important — this double-lined stainless steel sleeve ensures that the surrounding island structure is fully protected and that the installation meets clearance and safety requirements. If your island is built from non-combustible materials, consult Broilmaster's installation manual and your local codes to confirm requirements.