placement of CO2 detectors. --71.207.xxx.x

--193.42.x.xxx

Same confusion in many areas, CO rides low, smoke rises, if you use a plug-in variety CO unit the 18-24 inch above floor will catch those fumes - if you have a display 20PPM is when the detector should go into alarm. There are combo units which end up on the cieling to get the smoke primarily, I use battery backup models and I have a talking one in the adult group homes. --184.59.xxx.xx

I forgot to add that CO2 is what propels flavored soda from the handheld dispensers seen in adult beverage mixing shops. --184.59.xxx.xx

--69.130.xxx.xxx

I have been told smoke detectors go near the ceiling and CO detectors go near the floor,that being said do what your city law says as far as placement otherwise you will get in trouble for not following it --74.77.xx.xx

You want a separate Smoke and Carbon Monoxide detector, not a combination unit. Th CO sensor should be mounted outside each bedroom, around 5 feet from the floor. If the bedroom has two doors and one is connected to a bathroom, connected to another room like a laundry room, service porch, etc., THEN HAVE TWO CO SENSORS, ONE IN THE BEDROOM AND A SECOND ONE OUTSIDE THE BEDROOM IN A HALLWAY OR LIVING ROOM CONNECTED TO THAT BEDROOM. --47.155.xx.xxx

Unvented gas heat is asking for trouble. I see you are in ALabama so not as cold as here but can get cold. So many things can go wrong here with one dumb or impaired tenant. I have chimney attached gas heat air and boilers in my buildings. One building has very large windows and I installed supplemental electric baseboard heat in those two bedrooms. Upstairs unit relies on downstairs tenant with thermostat to keep the heat at a good temp. Because they cant be trusted I gave that unit supplemental baseboard electric also. It has worked out beautifully and I keep my tenants and they keep paying. Please consider electric baseboard instead of a potential death situation. --173.61.xxx.xxx

--71.207.xxx.x

Pulling a battery or unit is a lease violation and cause for eviction. They now sign off on that line in the lease. --107.147.xx.xxx

If unvented gas heaters were really bad, the EPA would have banned them decades ago and their sale would be illegal. My unvented gas heaters always pass inspection with no questions asked. So, lets not make a big deal here over something that is not a big deal. --71.207.xxx.x

--173.61.xxx.xxx

Lots of confusion everywhere. It is easy to know where to put a smoke detector. But what happens when you have a combo alarm system that also detects CO. Does the placement change? --24.101.xxx.xxx

--68.191.xx.xxx

Here unvented gas heaters are illegal where now most houses and buildings are becoming air tight. In the house have natural gas stove where use vent hood over stove to clear out fumes so no build up of carbon monoxide. In the house have two combination ac powered with battery back up combination smoke carbon monoxide detectors which work well along with apartment buildings have only one close to bedrooms. While the government here wants everyone to switch to heat pumps it does not make economic sense for me to do that as heat pumps will not work well in extreme cold temperatures along use EPA rated wood stove where use hgh efficiency gas furnace on and off. Wood is free where no carbon tax for heating. --207.236.xxx.xxx

BRAD --73.103.xxx.xxx

BRAD --73.103.xxx.xxx

Most of my houses do have Central Heat/Air which are Heat Pumps. --71.207.xxx.x

--71.207.xxx.x

Roy,have the tenants sign something acknowledging there are smoke and CO detectors,in my state i have to supply them but tenant has to maintain them. i had a small fire once ,tenant had removed batteries, fire chief told me to come to his office about it, i asked if i should bring that form and he told me not to bother coming in --74.77.xx.xx

--71.207.xxx.x

Drive me nuts LOL --69.201.xx.xxx

Where to place? IDK... it's weird because we are instructed to place them on the ceiling in the basement but then it gets weird after that. --69.201.xx.xxx

Jonny, in NY we are required to use 10 year sealed smoke detectors so i do now.It might be worth calling code in that city and ask,i have houses in a few different cities and they actually have different requirements --74.77.xx.xx

There are instructions in the box/package. That's what I read and follow. --172.59.xxx.xxx

Best option is to install a electrical box next to light fixture in hallways then install a combination smoke, carbon monoxide Ac powered with battery backup so as long the green light is lit then ok. Batteries last longer on Ac powered detectors. Wired right there is always power where regardless of light switch the detector will have constant power. --207.236.xxx.xxx