I have a small smoker, it is hot enough.
I do not try on big smoker.
The fan is fastened inside the plastic box by a small bolt/screw, you can dismount it from plastic box easily, then you can mount the fan directly on your smoker without the corrugated pipe when you do high temperature grilling.
I am sure high temp. grilling takes short time. If it is raining, you will not do grilling.
For low&slow the air flow shall be big enough.