… for central heating, not electrically heated, and parts thereof, of iron or steel; air heaters and hot air … (including distributors which can also distribute fresh or conditioned air), not electrically heated, … incorporating a motor-driven fan or blower, and parts thereof, of iron or steel. …
Explanatory notes
… for central heating, not electrically heated, and parts thereof, of iron or steel; air heaters and hot air … other parts of radiators. The following are not regarded as parts : (a) Pipes and fittings to … their pump), electric fans to supply air to the burners, regulating or control instruments (thermostats, pyrostats, …