Determine whether the following noise level is permissible with no additional control measure:   How much fresh outside air is needed to maintain the workplace air concentration of methyl ethyl ketone...

Determine whether the following noise level is permissible with no additional control measure:

How much fresh outside air is needed to maintain the workplace air concentration of methyl ethyl ketone below 100ppm, the TLV–TWA. During degrease operations, an estimated 3gal of MEK

evaporated in an 8‐hour shift, while ventilation quality is rated as average. Also, compute the air required if the operation is carried out in an enclosed hood with an opening of 50ft2 and a face velocity of 100ft/min. The temperature is 81 °F and the pressure is 1atm. The specific gravity of MEK is 0.81 and its molecular weight is 72.1. And the k‐value is 1/8 (0.125). Use the following equation, calculate required ventilation dilution air.

where Qv is the ventilation dilution air flow in ft3/min, Qm is the evaporation rate, M is the molecular weight of a volatile chemical, Rg is the ideal gas constant, T is the absolute temperature, k is the ventilation safety factor, and C is the vapor concentration in ppm.