Halon vs. dry chemical
My built in system is a halon system. The charge on the system can drop and need recharging but halon is a gas and, as far as I know, doesn't suffer from the compaction problems that most portable dry chemical extinguishers are susceptable to. My understanding is that the chemical systems should be shaken up from time to time to keep them at peak capability, even if the guage shows it's OK.
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