Making a fan shroud

Bewy said
Nice job, but you are blocking off a huge amount of airflow with the very nice baffle you have made. Expect it to run hot on the freeway....

I was wondering the same thing. I see louvers on some shrouds and figured it was to facilitate airflow at speed.

However I've done this before and still experience better cooling when moving than when still.

Worst case I can just make a new one with some slots for airflow.