Smoke and fire alarms very fast and dirty, and a link
http://www.nfpa.org/itemDetail.asp?categoryID=278&itemID=20526&URL=Research%20&%20Reports/Fact%20sheets/Fire%20protection%20equipment/Smoke%20alarms&cookie%5Ftest=1 Oh, that's a long one! I can summarize some of it in about as many keystrokes: 1. Ionization detectors are most common, contain... Sign in to see full entry.