smoke detector cover removal
Having bought a replacement hard wired smoke detector, now I find that I cannot remove the cover from the old one (which is wired only, no battery backup). Anything on this topic that I've found online has not helped. The unit does not have a visible manufacturer or model number, has no arrows, nor does it have any tabs to depress. When feeling between the edge of the cover and the base plate, there is nothing obvious. I have tried rotating it counter clockwise to no avail. I don't want to apply force and rip it from the ceiling. Can you help?