I have a 60 foot Ionics carbon fibre pole with 16 inch brush,the top piece is a fan jet but would be more suited to clean cladding as the spray is over the brush head,I would'nt use it on windows as it will spray above the window and drag down alot of dirt so for that reason I always use the pencil fitting as it directs the water to within the bristles,I use fan jets 80% of the time on my other poles that are not from Ionics but only because they are within the brush head and not over them therefore I know exactly where the water is going.