5. FIREPLACE CHECK5.1 Soundness for appliance attachmentTwo primary methods of retaining the appliance are provided: -1) By fixing to the fireplace front surround.2) Using concealed tension cables fixed to the rear of the fireplace opening togetherwith secondary fixing to the fireplace floor.The methods are detailed in section 9 of this manual. Before selecting the retentionmethod, consult with the customer. Method 2 is provided for instances where drillingholes in the front surface of the fireplace surround is unacceptable to the customer orotherwise impractical. N.B. It is unwise to attempt to drill into marble without theproper tools and equipment.If method 2 is chosen, make sure that the areas at the back and towards the centre ofthe fireplace floor are sound enough to take the eyebolts and screws. If these areashave deteriorated due to prolonged use, they should be made sound with suitablecement.If method 1 is chosen, make sure that the front surround area is sound enough totake the fibre plugs and woodscrews. If necessary, make sound with suitable cement.5.1.1 Installations using a metal flue boxThe whole of the top surface of the metal flue box must be covered with a 100mmlayer of mineral wool or equivalent insulation (See figure 2).5.2 Fireplace flue pull.Close all doors and windows in the room in which the appliance is to be installed.After confirming with a match that smoke is drawn into the flue, light a 13 gramsmoke pellet and check that there is a definite flow through the flue. Verify outsidethat the smoke exits from one terminal only and that the termination is suitable.Observe, where possible, upstairs rooms and loft spaces for signs of escaping smokeindicating a defective flue. If there is not a definite flow warm the flue for a fewminutes and repeat the smoke pellet test. If there is still no definite flow the flue mayneed remedial work – Do not fit the appliance until there is a definite flowthrough the flue.Page 23© Baxi Heating U.K. Limited 2009.INSTALLER GUIDE