(i)Water heaters;
(ii)Headers and manifolds; steam pressure reducing valves; calorifiers; radiators; heating panels; hot-air furnaces with distributing ducts and gratings;
(iii)Gas pressure regulators; gas burners; gas heaters and radiators and the flues and chimneys used in connection with any such equipment;
(iv)Plug-sockets and other outlets; electric heaters;
(v)Refrigerating machines;
(vi)Water screens; water jets;
(vii)Fans and blowers;
(viii)Air intakes, channels, ducts, gratings, louvres and outlets;
(ix)Plant for filtering, washing, drying, warming, cooling, humidifying, deodorising and perfuming, and for the chemical and bacteriological treatment of air;
(x)Pipes and coils when used for causing or assisting air movement.