A - Describe TWO tests that can be used to determine how well a natural draught flue is working.
(1)

(2)

                                                                            (2 marks)

B - State FOUR factors to be considered in selecting the position for an open flue terminal.

                                                                            (2 marks)

C - What are TWO of the possible dangers if the heat exchanger of a domestic warm air heating unit has a hole in it.

                                                                            (2 Marks)

                                                        ( Total 6 marks )



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