SL1100 Series is the Hearth & Home Technologies chimney system for wood-burning fireplaces. The SLA11 is an adapter that steps a 10" chimney connection up to 11", used where the SL1100 pipe is joined to a different pipe size. Install it per the SL1100 chimney instructions and confirm the approved pipe pairing before ordering. Always confirm the fit, approved components and clearances in your fireplace installation manual before ordering. Special order.