36x36x72 grow tent question

My new tent is 36x36x72 and the largest diameter ports are 7 inches.
What size ducting should I go with? 6 inches?
Also, what size fan and filter would you guys recommend for my setup?.as I think I understand it,
You want your filter to be larger in cfm than your fan..am I correct?
Thanks for all reccomendations and happy vibes for your grows!

I have a Mars tent 48''x48'', I use 6'' fan and carbon filter. I am not sure you need use 6'' or smaller one 4'', I think you can ask the sellers when you buy them.

I use a 6 incher in my 3 x 3 tent.

I have a 40"x40"x80" tent with a 6" exhaust fan @430 CFM and a 4" intake fan 190 CFM I bought a large carbon filter 400CFM ..... the longer the ducting and the more bends cuts down on air flow so a stronger fan than your carbon filter wont hurt anything