Anyone have any idea what the airflow of the default extractor fan is roughly? I want to upgrade it to something better, however I don’t actually know what is better.
Not sure what the stock fan is, but even with modifications to the shroud to close the air leaks it’s not much cop.
From what I read you want something that can push 400cfm. I bought one rated just above that and it’s great. Place it on the other end of your exhaust if you can, stops it getting clogged by soot. 
@I_Laser Thanks for the info I Laser. Yeah I basically want something that isn’t so weak. I have the exhaust venting outside via 4-5m of flexible pipe & the current fan is just not powerful enough. Could you please point me to where you bought your 400+ cfm fan?
