The Retrofit base support is adjustable from 120mm to 375mm from the wall, it can be used in conjunction with 90° or 135° tees when fitted directly above. This item can also be used as a load bearing intermediate support on longer flue runs and can be retro fitted to make installation simpler. One support to be used on most standard single story or 2 storey homes, supporting up to 9 metres of chimney immediately above the tee. Only recommended fixings should be used.