The tabs seem to be rigid and I don't want to snap any off so I always raise the dome with the fan off and go up on the roof to release the tabs. Good to know they won't break when removing from inside. I don't go up to the roof very often, but I have a look around while there just to check for problems. Last time up I found the boot on the antenna cable had slipped up and rain was on it's way. Moved it back into place and sealed it with silicone caulking.
Dave
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