Hans, thanks for expanding on my statements further up. The fridge you described is more of an all-purpose model than the one above.
The sealed or separate freezer door does indeed reduce the frequency of defrostings, and the drains make it a cinch. Since replacing the freezer door gasket on my Combo, I only defrost on average twice a year. It can use a defrosting now, but since the frost only accumulates on the ceiling, it doesn't make a mess of the contents. IIRC, the last time I defrosted was this past September, nine months ago! Of course, it's not my daily driver so the freezer door doesn't get opened for days at a time.
PAT, thanks for the info on the single door Combos' production run.
Eddie, I think you know this, but in case you don't, the two-door frosts-freely Combinations didn't use fans. Only the Frost Guard models did. After replacing our '70 Whirlpool frostless with the '57 Combo, it took a while to get used to the quiet when opening either of the Combo's doors.
With regard to fans in general, I have to say that our 2009 KA Architect SxS fridge is super quiet during operation, inside and out. Even the Combo has a forced draft condenser fan below, and it's more audible than the KA's. Inside the KA, the fans are a lot quieter than on previous fridges we've owned. Since expanding the opening that housed the dreadfully inadequate Samsung fridge that was here when we bought the new house, the KA shoehorned into the space perfectly and looks built-in, and it's nearly silent when running.