These requirements cover power ventilators of the roof-and wall-mounted types and duct fans of the straight-through type intended for commercial or industrial use@ residential fans intended for heated and conditioned air and for connection to permanently installed wiring systems in accordance with the National Electrical Code@ NFPA 70.These requirements do not cover the following:a) Ventilating equipment such as attic@ wall-insert@ ceiling-insert@ household hood@ window fans@ or canopy fans or blowers;b) Air-moving equipment with integral air-tempering means;c) Dryer type fans used for drying carpets or floors;d) Household and commercial blower inflator type fans;e) Evaporative coolers; Evaporative cooler pumps@ including retrofit pumps;f) Air filtering appliances;g) Deodorizers and air fresheners;h) Component fans;i) Low voltage component fans;j) Fans and blowers that circulate air@ such as desk@ ceiling-suspended@ and hasock fans;k) Ventilators rated more than 600 volts;l) Ventilators employing universal motors rated more than 250 volts;m) Air heaters equipped with fans;n) Draft fans for furnaces;o) Heating-ventilating units;p) Blowers employed as components in equipment such as furnaces@ mechanical-refrigeration equipment@ or air conditioners;q) Fusible links and similar equipment that may be provided to disconnect a fan or close shutters in the event of fire;r) Ventilators specifically intended for use in exhausting any of the following: gases other than air@ atmospheres causing corrosion to the ventilator@ air with water spray@ or flammable vapors; ors) Ventilators for the removal or conveyance of dust@ stock@ or refuse.t) Microwaves@ ventilating and otherwise; andu) Ducted and non-ducted heat recovery units.?