Neoprene 4" Duct Hose - 12'4" Neoprene Air Duct Hose 12' This Neoprene Air Duct Hose is perfect for cockpit cooling and other low pressure ducting applications where extreme heat can be avoided. The temperature range is 45 F to 330 F, which makes it ideal for most applications, most importantly bringing fresh cool air to your Quantum Cooler. Maximize air flow with the new Chillout Systems 2 ply Neoprene Air Duct Hose. Under hood applications such as connecting an air intake to