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: Ventilating equipment such as attic@ wall-insert@ ceiling-insert@ household hood@ window fans@ or canopy fans or blowers; Air-moving equipment with integral air-tempering means; Dryer type fans used for drying carpets or floors; Household and commercial blower inflator type fans; Evaporative coolers; Evaporative cooler pumps@ including retrofit pumps; Air filtering appliances; Deodorizers and air fresheners; Component fans; Low voltage component fans; Fans and blowers that circulate air@ such as desk@ ceiling-suspended@ and hasock fans; Ventilators rated more than 600 volts; Ventilators employing universal motors rated more than 250 volts; Air heaters equipped with fans; Draft fans for furnaces; Heating-ventilating units; Blowers employed as components in equipment such as furnaces@ mechanical-refrigeration equipment@ or air conditioners; Fusible links and similar equipment that may be provided to disconnect a fan or close shutters in the event of fire; 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; or Ventilators for the removal or conveyance of dust@ stock@ or refuse. Microwaves@ ventilating and otherwise; and Ducted and non-ducted heat recovery units.