hmm. im still not convinced anyone has a real pressurized cab. does anyone know if there is a separate fan for pressurization on any of them. if you have a cab with a good seal (and no negative pressure) you dont necessarily need pressurization. we have farm tractors with and without pressurized cabs and you cant tell any difference. the pressurized one i actually like less because there is too much air flow to be comfortable for the day, this is in part to some other design flaws tho. i do like how you can hear the whistling noise from outside the tractor from the air trying to escape the cab.
we make a giant indoor pile of shredded corn stalks every year and if you dont have a decent cab for handling this material you end up breathing corn stalk dust all the time. (which i do, and desire a pressurized cab because of it) this can be hazardous and some old timers ended up with "farmers lung" as they got older from breathing such dust.
aslo they say dust can reak havoc on your electric joystick controls.
on our 185 even tho the cab is sealed pretty good you can tell that the cab wants dust, it literally sucks it in the tiniest cracks. you would not believe how much dust comes through the cracks. im not really sure why, the cab must be getting a negative pressure from somewhere.
also the interior cab air filter is always extremely dirty because of all the dust entering the cab. probably should clean it once a week.