<prompt> To feel comfoable and cool in a factory the conrrected effective temperature in degree Farenheit should be -Less tha 69Between 69 and 76Between 77 and 80Between 81 and 82  <response>: Comfo zones: In deg C of corrected effective temperature Pleasant and cool 20 Comfoable and cool 20-25 69-76F Comfoable 25- 27 77-80F Hot and uncomfoable 27-28 Extremely hot 28 Intolerably hot 30. Parks Textbook of Preventive and Social Medicine, 25th Edition, Pg 792 