Pretty easy job. Toughest part is getting the particle board off the door panel. Found the factory missed installing about 6 of the T clips on one door, so it went faster than it should. The bad old days of MB quality control. Followed mercedessource recommendations for lubrication inside and created a big mess with grease on the inside of the windows.
Bought open cell air filter foam on Amazon that looks very close to the few remaining pieces of the OEM foam. Not a lot of difference in the air flow, but got all the disintegrating foam vacuumed up.
Bear in mind that where the perforated vinyl meets the air duct opening the vinyl is to be glued to the outer side of the air duct so air from the climate control system can enter from behind. If the vinyl is glued to the inner part the air from the climate control will do absolutely nothing but exit on the front of the perforated vinyl. Air flow through here wasn't ever a hurricane, but just enough to keep the door glass unfrozen/defogged, and only when the heat is on.
10-4 I caught that. I get some air up to the grab handle.
MB could have just put in a perforated duct from the dash and would be much more effective. And probably wouldn't crumble and make a mess.