COXREELS� 300 Series �Exhaust� spring driven reels are there to provide ventilation where necessary. This heavy duty frame was built to provide strength, stability and durability. The 300 Series reels have features found on many of our reels like spun discs, welded steel frame and enclose cartridge motor. These reels also feature an easy access panel to have access to the main drum with internal ducting included, making it ready to go.