On 11/30/2020 8:41 AM, FromTheRafters wrote:
Sid 03 expressed precisely :
Looking to install some new smoke detectors.* I was going to install
Ionization type smoke detectors in the lower floors and then a
combination smoke and CO* detector on the 3rd floor where the bedrooms
are located.

I noticed that most of the combo detectors do not use ionization to
detect smoke, but use photoelectric type sensors.** Is this a a big
deal or should I stick with the most popular ionization type ? Years
ago I was told by a contractor to not install combo detectors, but to
keep the CO and Smoke detectors separate ? Does anyone have an opinion
on that ?

If the CO detector has an interconnection wire for other alarms,
should you connect it to the interconnection wire for the fire-Alarms
? All this stuff is manufactured by Kidde, so I am assuming that is
all compatible ?

Thanks
Sid.

CO is heavier than 'air'. Smoke is generally in hot air and rises.--
follow their instructions for placement.

Heavier?

CO 28.01 g/mol
N2 28.0134 g/mol
O2 32.00 g/mol