I installed a new EPDM roof on my MH last month, while I had the old rubber off I made the decision to get rid of the TV antenna and the fridge vent, I blanked off both areas inside and out and renistalled the new EPDM roof. The antenna area was a constant leak problem and the firdge vent wasnt much better.
I removed the old fridge that was propane and electric and installed a smaller house type fridge thus the decision that I no longer needed the roof vent. I left the outside wall vent fully functional for venting and access to the back side of the fridge.
US Navy 1983-2003, C-130 F/E. 31' 1998 Southwind Storm P32 chassis, 7.4l (454), Toad 1998 VW Cabrio