Residentail refrigerators in motorhomes

I replaced my Not So Cold with a Samsung myself. My Not So Cold failed and when I pulled it out of the opening I saw that it was trying to catch the roof on fire on my 2004 Travel Supreme. Anyway we love it and would never go back to a Gas Absorption type fridge no matter the brand. But to answer your question of blocking of the old vent area's you do not need them the new refrigerator pulls air in underneath and around it circulating the area around the box to cool the coils which are located on the sides of the fridge. Our Motor home now stays more stable in temperature from the cold and hot temperatures than in the past reducing our heating and cooling needs to stay comfortable. We no longer have that cold draft feeling walking down the hall way from bedroom to living room area and the adjacent cabinets no longer feel cold in the cooler months like they did when we had the Norcold (aka not so cold). Hope this helps P.S. We now have cold ice cream, vegetables stay fresh much longer, no more defrosting and milk lasts forever compared to the old frig.