This is quite a number of fibers. If the person is at moderate work, tidal volume would be higher and also to some extent, respiratory frequency. The above value should be multiplied by about a factor of 3 to take a higher minute ventilation into account, due to moderate work.

Note: When the above formula is used, make sure the units are properly matched. A common mistake is to forget that exposure concentration is usually given in mg/m³ and VT is given in liter or ml. There are 1,000 liters in each m³ and 1,000 ml in each liter! Expert scientists have used the above formula and published results forgetting this.