Review on ThreeBulls 12 Pcs 120mm PVC Black PC Cooler Fan Dust Filter Dustproof Case Cover Computer Mesh - Keep Your Computer Dust-Free and Efficient by Trevor Garrett

I used them on a case from Revain Warehouse as the front intake filter was missing. The case is still sold by Revain but Corsair no longer makes it (Obsidian 750D Airflow Edition) and this part is no longer sold in the US and some places I found refused to ship to the US . Instead of spending $200 on a new case, I bought this one. They filled the air gap between and above the fans very well. If it weren't for the built-in front panel feet on my case, they could very easily be mistaken for a front cover.