You can't increase the fan. You can:
Please increase the fan's speed.
Please increase the fan speed.
Please turn up the fan.
Make the fan go faster!
Speed the fan up. (informal)
Hi thanks for your answer just had a query so to reduce the fan speed what do we say.
Also if we say Please turn up the fan speed will this be wrong,also can we say "Speed up the fan..is this wrong..thanks
Hi thanks for your answer just had a query so to reduce the fan speed what do we say.
Also if we say Please turn up the fan speed will this be wrong,also can we say "Speed up the fan..is this wrong..thanks