WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
84.14 - Air or vacuum pumps, air or other gas compressors and fans; ventilating or recycling hoods incorporating a fan, whether or not fitted with fiters. - Vacuum pumps 8414.20 - Hand- or foot-operated air pumps 8414.30 - Compressors of a kind used in refigerating equipment 8414.40 - Air compressors mounted on a wheeled chassis for towing 84 14.10 - Fans : 8414.51 - - Table, floor, wall, window, ceiling or roof fans, with a self-contained electric motor of an output not exceeding 125 W - - Other 8414.60 - Hoods having a maximum horizontal side not exceeding 120 cm 8414.80 - Other 8414.90 - Parts 8414.59 This heading covers machines and appliances, hand-operated or power driven, for the corn ression of air or other gases, or for creating a vacuum, and also machines for circulating air or ot er gases. R (A) PUMPS AND COMPRESSORS In general, air pumps, vacuum pumps and compressors function on the same princi Ies as and are broadly of sirmlar construction to the liqud pumps (piston, rotary, centnkga or ejector pumps) described under the preceding heading. P In addition, however, there are certain special types, particularly for producing high vacua, such as diasion pumps (the pump fluid belng oil or mercury), molecular pumps and entrapment pum s (getter pumps, cryopum s). Difislon pumps, however, are sometimes made of glass, in whic case they are excluded ( hapter 70). E \ distilling or evaporating etc. Air pumps serve Unlike liquid pumps, air or other gas corn ressors (other than low pressure or intermittent workin compressors are water-cooled or ave fins or other means for air cooling (surface cooling! to dissipate e considerable heat of compression which is generated. L % There are several types of compressors, for example, reciprocating piston, centrifugal, axial and rotary compressors. A special type of compressor is the exhaust-gas turbocharger used in internal-combustion piston engines to increase power output. Compressors are widely used : for compressing gases into gas cylinders; in chemical processes; for refr-igerators, etc. and for compressing air or other gases in reservoirs to be used to force feed machines or apparatus such as com ressed air engines, pneumatic picks, winches, brakes, pneumatic conveyor tubes, submarine allast tanks, etc. g The heading dso includes free-piston generators for gas turbines, consisting of two horizontally-op osed driving pistons slidin in a common cylinder which is extended and enlarged at eac end to form compression cy inders in which slide two other istons, connected to the driving pistons, forrnin a pneumatic recoil. The driving pistons are orced apart by the explosion of an ignited gas, t us displacing the com ression pistons. The return stroke of the compression pistons compresses air admitted into t e compression cylinders, and forces it through exhaust valves together with the exhaust gases. The high pressure of the hot gases enables them to be applied directly to the rotors of gas turbines, the generator thus replacing the usual combustion chamber and compressor of the gas turbine. R fi P \ As in the case of the pumps of heading 84.13, the airpumps and compressors of this oup may be built with integral motors or turbines, the latter being most often employed for hig pressure compressors operating on the principle of the multi-stage gas turbine in reverse. f- (B) FANS These machines, which ma or may not be fitted with integral motors, are designed either for delivering large volumes o air or other gases at relatively low pressure or merely for creating a movement of the surrounding air. Those of the first kind may act as air extractors or as blowers (e. ., industrial blowers used in wind tunnels . They consist of a ropeller or blade-t e impel er revolving in a casing or conduit, and ction on the princip e of rotary or centri gal compressors. P P f The second type are of more simple construction, and consist merely of a driven fan rotating in free air. Fans are used, inter alia, for ventilating mines and premises of all kinds, silos, shi s; for extracting by suction dust, steam, smoke, hot gases, etc.; for drying many materials ( eather, paper, textiles, paint, etc.); in mechanical draught apparatus for furnaces. f This oup also includes room fans, whether or not with a tilting or oscillatin device. These inclu e ceiling fans, table fans, wall bracket fans, ring mounted fans for buil%ng into walls, window panes, etc. f This heading excludes fans fitted with elements additional to their motors or housing (such as large dust separating cones, filters, cooling or heating elements and heat exchangers) if such elements give them the charactenstics of more complex machines of other headings, e.g., air heaters, not electrically heated heading 73.22), air conditioning machines (heading 84.15), dust extractors (heading 84.21), air coolers for e industrial treatment of matmals (heading 84.19) or for premises (heading 84.79), electnc space heating apparatus with built-in fans (heading 85.16). k (C) VENTILATING OR RECYCLING HOODS INCORPORATING A FAN, WHETHER OR NOT FITTED WITH FILTERS This grou includes cooker hoods incorporating a fan, for use in the $me or in restaurants, canteens, ospitals, etc., as well as laboratory hoods and industrial hoods incorporating a fan. g Compressors, air pumps, fans, blowers, etc., specially constructed for use with other machines reman classified in this heading and not as parts of such other machines. PARTS Sub'ect to the general provisions regardin the classification of parts (see the General Exp anatory Note to Section XVI , parts of e goods of this headin are also classified here (e.g., pump or compressor bodies, lades, rotors or impellers, vanes an pistons). b C i This heading also excludes : (a) Exhaust-gas turbines (heading 84.11). (b) Emulsion pumps (heading 84.13). (c) Pneumatic elevators and conveyors (heading 84.28). (d) Machines for cleaning, sorting or grading seed, grain or dried leguminous vegetables (heading 84.37). -
1.- This Chapter does not cover : (a) Millstones, grindstones or other articles of Chapter 68; (b) Machinery or appliances (for example, pumps) of ceramic material and ceramic parts of machinery or appliances of any material (Chapter 69); (c) Laboratory glassware (heading 70.17); machinery, appliances or other articles for technical uses or parts thereof, of glass (heading 70.19 or 70.20); (d) Articles of heading 73.21 or 73.22 or similar articles of other base metals (Chapters 74 to 76 or 78 to 81); (e) Vacuum cleaners of heading 85.08; (f) Electro-mechanical domestic appliances of heading 85.09; digital cameras of heading 85.25; (g) Radiators for the articles of Section XVII; or (h) Hand-operated mechanical floor sweepers, not motorised (heading 96.03). 2.- Subject to the operation of Note 3 to Section XVI and subject to Note 11 to this Chapter, a machine or appliance which answers to a description in one or more of the headings 84.01 to 84.24, or heading 84.86 and at the same time to a description in one or more of the headings 84.25 to 84.80 is to be classified under the appropriate heading of the former group or under heading 84.86, as the case may be, and not the latter group. (A) Heading 84.19 does not, however, cover : (i) Germination plant, incubators or brooders (heading 84.36); (ii) Grain dampening machines (heading 84.37); (iii) Diffusing apparatus for sugar juice extraction (heading 84.38);