Animal husbandry fan in the life will be common to its shadow, its main function 
is ventilation, then in different occasions, animal husbandry, ventilation and 
ventilation of the time requirements of what?

1, the general environmental requirements of the number of livestock fans 
ventilation for about 28 hours each time;

2, in crowded places, ventilation time for about 35 hours each time;

3, there are heating equipment production workshop, livestock fan ventilation time 
for 45 hours each time;

4, livestock fan ventilation time in the high temperature and pollution of the 
workshop, for 55 hours each time;

5, in the more humid areas of the number of livestock ventilation ventilation to 
the appropriate increase, and vice versa to the corresponding reduction.