| 4.3 Flue Preparation All flue assemblies are designed for internal installation (optional wall liner is required), given that there is sufficient clearances opposite to the flue for the installation of the flue. If there is insufficient clearance the flue can be installed from outside. For a wall thickness up to 300mm, provided that there is sufficient space and the optional wall liner kit is used the flue can be fully installed from the inside. For a wall thickness of over 300mm the external flue hole will need to be made good from the outside. This applies also if you use the flue kit without the optional kit, irrespective of wall thickness. 4.4 Rear and Side Flue Application Select the boiler location and flue application, with due regard to the terminal position. Take the template from the boiler pack and temporarily position it on the wall, making sure that the minimum clearances are maintained, see diagram 1.2. For a rear flue mark the position of the flue as diagram 4.4. For a side flue, extend the centre line horizontally left or right to the corner of the adjacent surface where the flue is required to exit to outside. Mark the position of the centre of the flue and boiler, as diagram 4.4. 4.5 Flue Hole Cutting Having marked out the flue centre cut a hole for the flue using, preferably, a 115mm minimum core drill. |