It only has one fan between the compartment with the mobo and the compartment with the hard drive. It appears to draw air from the side with the HDD and blow it out across the mobo. This system probably creates enough of a vacuum to create decent airflow while minimizing noise. Since the coolest air is hitting the HDD I don't think it'll create a long term durability problem. Just make sure you give it enough space on the sides and keep the vents clear of dust bunnies.
Developer for VideoReDo