Pair Packed 5" Crossflow 12VDC Car Truck Cooling Fans Pair Packed. 5" Cross Flow Cooling Fans. Compatible with all 12-volt systems, Simple 2 Wire Installation. Low profile crossflow design provides generous air flow. Puts out 40 cubic feet of air flow per minute. Lightweight and compact design allows installation in tight fitting spaces Each Fan Measures 5.5" x 1.75" x 1.75"