Anybody know what the most compact FACP is?

Would love it for the miniature fire alarm system i have in my bedroom, all it needs is a panel and i could hook up my smoke detectors to it and a second pull station

The Fire-Lite MP-12/24 is a tiny fire alarm panel. They’re discontinued and very expensive in general, but they’re one of the smallest panels. Two zones, 1 NAC.

Some other contenders are EST FireShield (1-zone), EST 2400 (1-zone), Fire-Lite MS-2/4, etc.

Yeah, though usually “small panel” also often translates to “few features” just the same: they might be relatively inexpensive but most also really can’t actually do much of anything. The Fire-Lite MS-2 & MS-4 are also not really that reliable or of good quality from what I’ve seen, & they both output FWR, which makes electromechanical horns buzz & kills Simplex signals.

i found one crazy cheap MP-TR24 Fire-Lite
i wouldnt trust it though i would likely get a used one off ebay

there is one at my local gym and pool center. it only serves the pool and is paired with a single system sensor spectralert classic and a 8 inch bell (right next to the spectralert classic horn strobe) and a BG-8 near the door. i do not think it works anymore as it displays troubles on all zones and is in really bad shape.

4001s are certainly small physically. Not as small zone/nac wize as, say, an SK/MS-2 though