Name ten of the twenty-one FAIL conditions in heating safety.

1) Escaping gases from disconnected or broken vent pipes 2) Improper fuel storage and supply lines 3) Shut off valve must be located at the base of the tank 4) Fuel leaks 5) Fuel tank not vented and not filled from outside unit 6) Existence of an improper flue or chimney 7) Presence of combustible material around furnace 8) Improper maintenance of the equipment 9) Flue pipe and collar which don't fit tightly against the wall 10) Return air not drawn from an area separate from the furnace area