Tent exhaust hole smaller than fan and hood

I just got in a new grow tent and after setting it up i realized that the exhaust hole in the tent are ~5in and my hood and fan are both 6 inches. I have a 6"-4" reducer for the ducts but I am wondering how much this will restrict my airflow? Any suggestions on how to get around this problem?

what the crap.... do they even make 5in inline fans? I've never seen a reducer to anything but even numbers.

Ace Smoking said:

what the crap.... do they even make 5in inline fans? I've never seen a reducer to anything but even numbers.

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I can tell its probably designed for a 4 inch duct

well, a quick google search shows that the 6-5in reducer does exist. You'll probably have to order one online as I haven't seen them in any large US hardware store.

Anyone know exactly how much reducers effect your air flow?