This is 9inch Forward Fan. It can be used as Exhaust as well as Fresh Air fan. It has switch to reverse the airflow direction.If you are on the lookout for a latest exhaust fan for your bathroom or kitchen, then consider the Crompton Greaves Driftair exhaust fan. This three blades exhaust fan is made of made of metal, thereby making it completely rust-proof. The fan, from the house of Crompton Greaves, Ideal for Mounting on Glass Windows This exhaust fan is perfect for mounting on the glass windows. It is lightweight and the glass can take the weight of the fan. This exhaust fan available in grey.