I was bored and decided to calculate how restrictive the front intake area is on a Lian Li case. I used my Lian Li PC-65 as a reference. The Lian Li PC60/61/65/70/75 is also applicable as well as they share a similar intake design.
Note: the fan area calculations will vary as the exact sizes of different fans varies. I used a coolermaster LED fan for my measurements. Oh ya, I tried to write it neatly, let me know if my handwritting is legible.