When it comes to building a high-performance PC, it’s important to have good airflow in the case to keep your components cool and prevent overheating. There are several factors that can contribute to good airflow in a PC case, including the number and placement of fans, the size and design of the case, and the type of components you are using. Here are some of the PC cases with the best airflow in the market:

- Fractal Design Meshify C: The Fractal Design Meshify C is a mid-tower case that is designed specifically for high airflow. The front panel is made entirely of mesh, which allows for maximum airflow into the case. The case also comes with two pre-installed fans in the front and one in the back, and there is room for up to two additional fans on the top and one on the bottom. The Meshify C also has a tempered glass side panel that allows you to show off your components while still maintaining good airflow.
- Corsair Obsidian Series 500D RGB SE: The Corsair Obsidian Series 500D RGB SE is a full tower case that is designed for maximum cooling performance. The case features a dual-chamber design that separates the power supply and storage from the main components, allowing for better airflow. The front panel is made of tempered glass and aluminum, with three intake fans for optimal airflow. There are also two exhaust fans on the top and one on the back, and there is room for up to four additional fans or radiators.
- Cooler Master H500M: The Cooler Master H500M is a mid-tower case that features a mesh front panel for maximum airflow. The case comes with two 200mm RGB fans in the front and one 140mm fan in the back, and there is room for up to three additional fans or radiators. The H500M also has a tempered glass side panel, a built-in fan controller, and a removable top panel for easy access to the fans.
- Phanteks Enthoo Evolv X: The Phanteks Enthoo Evolv X is a full tower case that is designed for both style and performance. The case features a unique dual-system layout that allows for two separate systems to be built in the same case. The front panel is made of aluminum and tempered glass, with three 140mm fans for maximum airflow. There are also two additional fans in the back and one on the top, with room for up to five more fans or radiators.
- NZXT H710i: The NZXT H710i is a mid-tower case that features a sleek, minimalist design with excellent airflow. The case comes with four 120mm fans pre-installed, two in the front and two in the back, and there is room for up to three additional fans or radiators. The H710i also has a built-in fan controller, a tempered glass side panel, and a cable management system to keep your build looking clean.
In conclusion, there are many PC cases with excellent airflow on the market, and the choice depends on personal preference and specific needs. However, the cases listed above are some of the best options available, with features such as mesh front panels, pre-installed fans, and room for additional fans or radiators to keep your components cool and prevent overheating.