[swally]

Originally Posted by Ecuadog

Filtrete 16x25x1, MERV 13... change every 3 months... probably overkill.

Not for those thin ones. 1” is a monthly change. Depends on quality too.

[retiredguy123]

Originally Posted by DrHitch

True...My comment was more for standalone battery detectors, not those that are AC hardwired with battery backup. Yes, it's really best to simply replace the entire unit with one with a 10-year lithium battery.

I would just comment that standalone detectors with replaceable batteries wouldn't comply with the current Electrical code. All detectors must be hardwired, or if you build a room addition, you must use a sealed detector with a permanent battery.