Recommended by firefighters
Protect Your Family from the dangers you can’t see
Real-time CO and gas monitoring for greater safety throughout your home.
4.8 · 2,127 verified Customers
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30-Day Guranatee
2,127 verified Customers
As featured in
How It Works
Setup takes minutes. Monitoring starts right away.
STEP 1
Power Up
Connect Gasfence™ to power and place it in the appropriate area of your home. A 9V battery can also be installed for backup power during outages.
STEP 2
See Live Levels
The large color LCD shows real-time CO levels in PPM, combustible gas in %LEL, temperature, and humidity at a glance.
STEP 3
Stay Alert
If levels rise toward alarm thresholds, Haven's 85 dB alarm activates, giving you time to act before it becomes an emergency.
Gasfence™ keeps you informed before danger escalates
It gives you real-time CO and gas readings, so you can see what’s happening in your air instead of waiting for a loud alarm. Monitor changing levels, recognize potential danger early, and take action when it matters most.
The danger you can’t see
Carbon monoxide can build up before you realize there’s a problem.
You can’t see or smell carbon monoxide. Gasfence™ gives you real-time CO readings in PPM, helping you stay aware of changing levels instead of relying only on a sudden alarm.
0 PPM
Know your normal air level
50 PPM
Stay alert to rising CO levels
150+ PPM
Gasfence™ triggers its alarm
Meet Gasfence™
The detector that shows you what’s in your air.
See real-time CO and gas levels on a clear color display, monitor temperature and humidity, and get an audible + visual alert when levels reach the alarm threshold.
See real-time CO & gas levels
View CO and fuel gas readings clearly, helping you recognize changing levels before danger becomes harder to detect.
Plugs in anywhere in 30 seconds
Install Gasfence™ easily throughout your home, including bedrooms, kitchens, garages, living rooms, offices, and RVs.
Adjust the Alarm to Your Needs
Choose from three sound levels and three brightness settings for comfortable monitoring throughout daytime or nighttime.
Recommended by firefighters
Designed By Firefighters. Built To Save Lives.
Gasfence™ was developed with first responders who saw the same tragedy repeat itself families with "working" detectors who never got the warning they deserved.
✓ UL 2034 Certified — Strictest CO detector standards in North America
✓ Professional-Grade Sensors — Same technology used by fire departments
✓ ETL Listed — Independently tested for safety and accuracy
Gasfence™ isn't just another detector. It's the detector firefighters wish every home had.
Like having a fire station in your hallway — watching the air so you don't have to.
4.8 · 2,127 verified Customers
What Our Customers Are Saying
I wanted a detector that actually showed me what was happening instead of simply waiting for an alarm. Gasfence™ gives me that visibility in a compact, easy-to-read design.
Emily K.
Verified Customer
I installed Gasfence™ near our kitchen, and I love seeing the readings clearly on the display. It gives me extra peace of mind knowing our home is being monitored.
Lauren B.
Verified Customer
We placed Gasfence™ in our kitchen because of our gas appliances. The combination of gas and CO monitoring gives us another layer of protection for everyone in our home.
Rachel M.
Verified Customer
After comparing several detectors, I chose Gasfence™ because it monitors more than just CO. The real-time gas, temperature, and humidity readings make it incredibly useful.
Olivia R.
Verified Customer
See Gasfence™ In Action Today
Watch how Gasfence™ monitors CO, gas, temperature, and humidity.
30-Day Money-Back Guarantee
Your Gasfence™ purchase is protected by our 30-day 100% money-back guarantee. If you're not completely satisfied with your detector, simply reach out to us within 30 days and we'll help make it right or refund your purchase. Feel confident knowing your home’s safety comes with zero unnecessary risk.
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