Sizing of air grille for whole house fan via /r/DIY

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Sizing of air grille for whole house fan

I'm building/installing my own whole house fan and will be pulling 1600cfm through a 16" duct. I was originally going to get a simple 16×16 return air grille with 1/2" slats (pic below), but then thought this might only be half the surface area that I need to meet the fan needs. Is this true? They also sell a 30×14" grille which would have more similar ventilation surface area to the 16" duct (half of 30×14 is 210 sq inches) but this seems more unsightly than what I originally had in mind.

Just wanting confirmation that I'm thinking about this right. Thanks in advance.

https://preview.redd.it/j5jwlhivufw61.jpg?width=160&format=pjpg&auto=webp&s=c5f5b83a3a4440f0ee4d58643d8249d44de062ed

Submitted April 30, 2021 at 11:45PM by Wookiecologist
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