I installed this as an external fan five years ago and left the interal in there for years (turned off by telling the machine that the air filter is connected) - eventually I got in there and removed it and there is a bump in how fast smoke gets removed - but not enough that I regret the years with it in there but not on.
When you do it get the external put it at the end of your exhaust run.
Machine → hose → fan → window (or whatever your specific set-up is).
You can put it right at the back of your machine, but it’ll do better as close to the end as possible.
I also suggest getting either a solid or insulated hose