In article . com, Capt
John writes

If you go with a
halon unit, get it with a manual release as well.


Good advice.

Believe it or not, a lot of boat builders and non-specialist installers
fit manual extinguisher releases using standard control-type cables
which in the event of a fire can (and often do) melt or seize before
it's noticed.

Make sure yours is fitted using heat-resistant cable.
--
Marshall Rice

(Put the bin out to email me)