Dog Fans - AirFlow Dually
AirFlow Dually by OakLines. USB powered Dog Fans designed for the Ruffland crate door. Also works with wire crate and vari kennel doors.
Powered by any standard USB port – use your vehicle power outlet - a phone charger plugged into the wall - or go portable with a USB power bank.
High volume low pressure air exchange - simple and effective. Contiunous AirFlow - like a silent gentle breeze.
Here are some Amazon affiliate links that might prove useful when installing in a vehicle:
Battery Powered / Vehicle Charged