Of cast iron

73.22 - Radiators for central heating, not electricall heated, and parts thereof, of iron or steel; air beaters and hot alr distributors &luding 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. - Radiators and parts the~eof: 7322.11 - - Ofcastiron 7322.19 - - Other 7322.90 - Other This heading includes : (1) Radiators for central heating, i.e., space assembly of" sections " of flanged or lled tubes water or steam from the boiler is cirt:u ated. Such wood or metal. 8i This grou also includes apparatus consisting of a combination of a radiator through which hot or coPd water is circulated and of ejector nozzles through which conditioned air under pressure is passed. The two components are mounted in a common housing fitted with a grille. When the radiator unit is huned off, this apparatus serves as a distributor of conditioned air. The heading does not cover air conditioning units (heading 84.15) or electric radiators (heading 85.16). (2) Identifiable '' sections " and other parts of radiators. The following are not regarded as parts : (a) Pipes and fittings to connect up central heating boilers and radiators (headings 73.03 to 73.07). (b) Radiator stands (heading 73.25 or 73.26). (c) Steam or hot water taps, cocks, etc. (heading 84.81). (3) Air heaters, using any type of fuel (e-g., coal, fuel oil, gas). These self-contained heaters, fixed or mobile, consist mainly of a combustion chamber (with burner) or a grate, a heat exchanger (tube assembly, etc.) which transfers the heat given off b the combustion gases assing through it to the air travelling along its outer surface, an a motor-driven fan or lower. Generally these heaters are furnished with an exhaust flue for burnt gases. i i Air heaters (fixed or mobile), which generate hot air for direct diffusion, differ from radiators inco orating their own heating elements (as described in the Explanatory Note to heading 73.28 by the fact that they incorporate a blowing device (fan or blower) which serves to distribute or direct the supply of hot air to the various areas which are to be heated. Air heaters may be equipped with various ancillary devices such as burners (with their pump), electric fans to supply air to the burners, regulating or control instruments (thermostats, pyrostats, etc.), air filters, etc. (4) Hot air distributors which consist of an air heating element usually comprising an assembl of flanged or illed tubes and an electric fan, mounted in a common housing provide with air outlets ?grille or adjustable shutters). 7' These distributors are designed for connection to a central heatin boiler and ma be designed to stand on the ground, to be fixed to a wall or to be hung om the ceiling, &om beams, pillars, etc. f Some of these appliances may also be rovided with an outside-air intake enabling them to be used as fiesh a r distributors when t!I eir heating element is turned off. The heading does not, however, include distributors of conditioned air which mix,. under +e control of a room thermostat, hot and cold air supplied under hrgh pressure and whtch consist essentially of a mixing chamber and two inlet nozzles fitted w t h control valves operated by pneumatic actuators, the whole being mounted in a common housing and incorporating neither a radiator nor a motor-driven fan or blower (heading 84.79). Air heaters and hot air to be used. The various materials However, hot air must necessaril be connected to the application of d t e 1 (g) to Section XV (5) Identifiable parts of air heaters or hot air distributors (heat exchangers, nozzles, direct diffusion conduits, dampers, grilles, etc.). The following are, however, not regarded as parts : (a) Pipes and fittings to connect up boilers with certain hot air distributors (headings 73.03 to 73.07). (b) Fans (heading 84.14), air filters (heading 84.21), checking and automatically controlling appliances (Chapter 90), etc.