I leave my fans running 27/7 i read some where that if your enviroment is 10 degrees cooler durring the dark period the plants will grow better i dont know if it works or if it is true but i use the fans to bring down night time temps

good luck
smokesalot Reviewed by smokesalot on . exhaust fan ti ming exhaust fan can i keep it running all the time or do i turn it on on certain hours Rating: 5