1220.4. In our area we have native Bluestem prairie grass. It has some real fuzzy seeds that work through the fine mesh screens on my blue tractor, so the 3/16 holes on the MTZ is like the diffe rence between window screen and chain link fence. My Blue tractor has the A/C condensor and the hyd cooler on a sliding frame to pull out and clean. The a/C condensor is maybe 1/8in from the Intercoler and the intercooler is pressed against the radiator. I need to blow this crap out, but it is going to take at least 3 hours to pull the frames and other parts out to get an air blower close to where it needs to blow out the intercooler and other parts... I have to blow out the blue tractor at least every hour when baling hay. There needs to be a design change here....