Does it use the same ceiling mounts as previous first alert detectors?

The ceiling mount is different, but the screws are in the same place. Just loosen the screws, swith mounts, and tighten back up.

Do you ceiling mount this fore/co2 alarm? doesn't co2 settle to the ground first?

This is a CO alarm, not a CO2 alarm. CO2 is what makes your soda fizzy and is in in chained cylinders at restaurants... CO is an odorless, tasteless, colorless gas. The ONLY way to detect it is by detector. It is generated by any gas-powered appliances like dryers, stoves, snowblowers, cars, etc, and by burning like fire places. CO is BARELY lighter than air (about .96 to air being 1 for vapor density), and will mix and collect like normal air does, with drafts and normal air movement. CO detectors can be mounted at just about any height, though many manufacturers (somewhat arbitrarily) picked 5ft or chest height as the ideal mounting height. Smoke and heat rise, so smoke/heat detectors are required to be mounted within 12" of the ceiling. Combination detectors are common, and need to be mounted within 12" of the ceiling for the smoke function to operate properly.

Does this device contain a hush feature to silence nuisance alarms?

It didn't on the one(of 5) that I purchased and had to take down.

I have just removed 4 model no. 7020b because it was incompatible with my outback solar energy system. will these mount over the same opening?

The actual base is 6 in in diameter and the holes for screws are 4 inches apart

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Specifications

Brand	First Alert
Style	Standard Detection
Power Source	Battery Powered
Color	White
Product Dimensions	1.38"D x 5.75"W x 5.75"H
Alarm	Audible
Operating Humidity	70 percent by volume
Sensor Type	Electrochemical, Photoelectric
Global Trade Identification Number	00029054014504
Material	Plastic
Number of Items	1
Manufacturer	First Alert
UPC	029054014504
Part Number	PRC710
Item Weight	6.7 ounces
Item model number	PRC710
Batteries	1 Lithium Metal batteries required. (included)
Is Discontinued By Manufacturer	No
Size	One
Pattern	PRC710
Voltage	120 Volts
Item Package Quantity	1
Number Of Pieces	1
Luminous Flux	No
Certification	not_applicable
Included Components	First Alert PRC710 10-Year Combination Carbon Monoxide and Photoelectric Smoke Detector, Mounting Bracket
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium
Average Battery Life	10 years
Warranty Description	Warranty

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