According to the mounting instructions, the best place to mount the Kidde KN-COSM-B is on the ceiling 4 inches 4 inches away from any wall; however, also in the installation instructions, an acceptable mounting can be done on a wall 4 inches below the ceiling but no more than 12 inches from the ceiling.

I thought carbon monoxide detectors should be installed close to the ground?

Molecular weight of air (the mixture of gasses) is 29 g/mol, and molecular weight of CO is 28 g/mol. Air is mostly nitrogen, N2, and its molecular weight is 28 g/mol. In a still room, CO would have a slight tendency to rise. In an average house with some activity, CO would be evenly dispersed. Bottom line is that you could put the detector at any height and it should be okay, but higher would be marginally better.Contrast this with carbon dioxide, CO2, which has a molecular weight of 44 g/mol. This is significantly heavier than air. When I ferment my homebrew in a chest freezer, the generated CO2 doesn't come out quickly when I open the top. I can lower a flame into it, and it will extinguish when it hits the CO2 level. Try it, it's fun!M.Hall, Ph.D.

Does this detector have a hush feature?

It DOES have a hush feature. Pushing the test/reset button temporarily desensitizes the smoke alarm for approximately 10 minutes. It will automatically reset and sound again if smoke is still present. This process can be repeated until the air has cleared.

Is it suitable for a RV?

I would think so. It runs on batteries so you can put it up anywhere.

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Kidde KN-COSM-BA Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm , WHITE

Product ID: 2072181

Details

Alarm
Audible
Brand
Kidde
Color
WHITE
Item Weight
10.4 ounces
Operating Humidity
10 to 95% (RH)
Power Source
Battery

🔊Talking alarm announces hazard type

🔋Battery safeguard prevents missing batteries

🛠️Easy install, no wiring needed

Description

🚨 Speak Up for Safety: The Alarm That Talks So You Don’t Have To!

CLEAR VOICE ALERTS - Hear exactly what’s wrong with loud, distinct warnings for fire, CO, and low battery—no guesswork.
SMART HUSH FEATURE - Silence nuisance alarms safely for 10 minutes with a voice-confirmed hush mode—no more smoky dinner panic.
UL CERTIFIED SAFETY - Meets rigorous Underwriters Laboratories standards with a 10-year limited warranty for peace of mind.
DUAL HAZARD PROTECTION - One sleek device covers both smoke and carbon monoxide detection, replacing two alarms with one.
HASSLE FREE INSTALLATION - Battery-powered and wire-free, install anywhere in minutes—perfect for renters and busy pros.

The Kidde KN-COSM-BA is a battery-operated combination smoke and carbon monoxide alarm featuring a unique talking alarm system that clearly announces the hazard type detected. It uses ionization sensing technology for fast fire detection and includes a hush button to silence false alarms. Designed for easy installation without wiring, it runs on three AA batteries and meets UL safety standards. With a compact white design, tamper-resistant features, and a 10-year limited warranty, it offers reliable, dual hazard protection for any home.

Specifications

ASIN	B00004WA4C
Alarm	Audible
Best Sellers Rank	#621,467 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #146 in Smoke & Carbon Monoxide Alarms
Brand	Kidde
Built-In Media	900-0102
Color	WHITE
Customer Reviews	4.5 out of 5 stars 1,552 Reviews
Enclosure Material	Bamboo
Global Trade Identification Number	00784908010209
Item Dimensions D x W x H	1.8"D x 5.6"W x 5.6"H
Item Type Name	900-0102
Item Weight	10.4 ounces
Manufacturer	Kidde Safety
Manufacturer Warranty Description	Ten-year limited warranty
Mfr Part Number	900010202
Model Number	KN-COSM-BA
Number of Items	1
Operating Humidity	10 to 95% relative humidity (RH), non-condensing
Power Source	Battery Powered
Product Dimensions	1.8"D x 5.6"W x 5.6"H
Product Style	Previous Model
Sensor Type	Ionization
Style	Previous Model
UPC	251221511138 783324977752 047871072866 784908010209 047871090686 094700377241
Unit Count	1 Count
Upper Temperature Rating	100 °F

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