Question on equiptment

sup all, right now i'm working on the end of my veg process in a "home box L".
here are the dimensions of my inlets and outlets:

roof: 200mm (7 3/4 in)
back top: 90mm (3 1/2 in)
bottom right: 160mm (6 1/4 mm)

RE-Edit : im going into flowerin soon and i know ineed a filter and a fan to go with it but im not sure how to install it.
I assume im supposed to get a fan that will fit into the top of the tent and then attach the filter to the top of the fan, is this correct?

for most filters you want to go from box-filter-fan-outside so that you are pulling air through the filter

desertrat said:

for most filters you want to go from box-filter-fan-outside so that you are pulling air through the filter

Click to expand...

ahh ok thx desertrat, but how big should my fan and filter be in comparison to my box?