After about 4 years of using wfp I thought I'd give fan jets a try, I've had them in my little box for over a year now.
After doing a few windows, I decided I'd just water the plants with them. They are utterly hopeless. Let me explain.
My main issue is that there is almost no flow whatsoever. There is lots of noise (talk about jet wash) but very little water actually coming down the glass. So it takes ages to rinse/clean a window. If you are in the business of money making, and want to be finished with work before the sun goes down, avoid fan jets. It's just so slow. It's absolutely useless compared to pencil jets. It's even worse if you lift the brush off.
If you do dare to lift the brush even a centimeter everything gets covered in droplets. Which turn into big drops which hang off the top of the frame etc etc. You can't selectively rinse a part of the frame or glass just to get some bits down, or with precision blast some stuff out of a crevice, like you do with pencil jets.
Maybe if you use a super slow flow rate with pencil jets there is some comparison, but if you are serious about increasing speed, your flow rate is way up there anyway.
I think you get the point.
Just in case anyone is interested I used the Lurmark ones, 40 degree.
