Extractor Fans

There are many types of extract fans on the market now and they dramatically vary in size and price.

Your basic fans start with TT fans that are small and have a limited air flow but can be perfect for small grow rooms. Systemair RVK fans and Can fans are the most used fans in the industry having a wide variety of sizes and good flow rates. Can Max-Fans are the next step up bringing you two different flow rates with the same fan. 

Systemair's latest fans are the Revolution AC Stratos and the Revolution EC Vector fans. These are both compact but bring excellent flow rates and reduced noise levels.

For complete acoustic fans you need to be looking at the Iso Max fan, Q Max fan and the Gorilla Box fan. All three of these have excellent flow rates with very little noise.