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 also cover dryer exhaust duct power ventilators (DEDPV) for single residential dryers. 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 hassock 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; or s) Ventilators for the removal or conveyance of dust@ stock@ or refuse. t) Microwaves@ ventilating and otherwise; and u) Ducted and non-ducted heat recovery units.