Antec 300 side fan filter issue.

[WhipperSnapper]

I just obtained an Antec 300 case and I'd like to add a side intake fan and filter. However, the grill (integrated with the side panel) sticks out. I want to add this magnetic filter on the outside, would I have a problem? Would I need to take a rubber mallet and pound the grate flat?

http://www.newegg.com/Product/Product.aspx?Item=N82E16811999234

Here's the specs of the rig I bought ($600, essentially brand new)

Core i5-3570K (quad core, Ivy Bridge, unlocked, OC to 4.5 Ghz)
Corsair H60 Water Cooler HSF
8 GB generic RAM from a Dell (2x2x2x2)
ASUS P8Z68-V LX mobo
EVGA GeForce GTX 560 2GB DDR5 (special model for Best Buy)
128 GB Kingston HyperX SSD
Windows 8 Pro
Antec BP550 Plus modular power supply
Antec 300 case (only has the rear and top fans)
DVD-RW drive

 

[WhipperSnapper]

Now that I think about it. I can just tape used dryer fabric softner sheets to the side and it doesn't matter if the grate sticks out and it would be free. Ghetto, but free.