You need to go to Wards webpage and read the information there. I compared them to the others when I bought mine. The luv ones, to me, are so ugly I would just as soon the bike got hot. But blade size does not make a fan more efficient alone. The Wards do move massive amounts of air, the sensor is easy to install and they wire up to the aux plug. Once on, you just forget them, they come on when the need to run and go off when not. If you try to operate them manually you will let the bike get to hot before starting them and it is nice to get off and walk away from the hot bike knowing they will help cool it and then shut off by themselves. Ward tries to start the cooling process prior to it being hot and keep it there. Luv deals may work great, But in my opinion they are not in the league of Mr Ward's.