PLEASE MEASURE YOUR ROUGH VENT OPENING BEFORE ORDERING! If your current vents are smaller than the AirDirect Air Vents outer diameter, you will have to cut the rough opening to 5.25" to be able to install our vents.   Air vents re-imagined: In a traditional ducted system, air will travel down the ducting channel from the RV AC and sometimes blows right over the air vent diffuser. This results in less cold air to the interior of the RV... The Air Direct Air Distribution Systems improves how the cold air is delivered to the inside of the coach! RV Airflow Systems new, patent pending Air Direct Systems is engineered to create just enough turbulence above the diffuser to catch and direct the flow of air and force it out of the vent into the RV. This allows for an average of 15% more air flow at each vent without deteriorating the volume of air for the next vent down wind. Designed to eliminate inefficiencies that frequently develop in RV HVAC systems. Keeping you Cooler, Faster, and more Comfortable! Features & requirements:• Overall dimensions: 7" diameter x 2 5/16” deep• Rotating RV vent fits 5 1/8" duct openings • Diffuser diameter: 5-1/2"• Louvered diffuser rotates 360 degrees • Hardware included for mounting vent housing• High Impact Polystyrene (HIPS)• Made in the USA• Rough vent opening: 5-1/4" diameter x 1 1/4" deep Installation Tips and Tricks: Short video showing the AirDirect Air Vent installation as well as some tips and tricks if your rough vent opening is smaller than ours! Please click HERE to see the full RV Airflow and AirDirect Air vent installation with before and after results.