Rear air flow kit for 2012-2021 Nissan NV3500 passenger vans. This kit will deliver high air flow to the front, middle and rear overhead air vents of your Nissan NV passenger van. This kit will increase air flow by 90% or more. It replaces the original poorly designed Nissan restricted duct system. This is an enclosed system that utilizes new high flow plastic air ducts. This system comes complete with plastic overhead ducts, side ducts, duct hoses, ac unit air port adapter, mounting hardware, Headliner retainers, written installation instructions and youtube installation video. This kit will take about 5 hours to install. This includes removing the restricted headliner duct, cleaning your rear evaporator, installing Reflectix insulation on your inside roof panels and installing the kit. This rear air flow kit is a permanent fix for your rear ac system. Developed and Made in the USA.