An atmospheric vent is a venting system used in gas water heaters to safely expel combustion gases to the outdoors. It relies on natural draft, where hot gases rise through a vertical vent pipe without a fan. Proper sizing and adequate combustion air are essential to prevent backdrafting, which can allow gases like carbon monoxide to enter living spaces.
/ˈæt.məsˌfɛr.ɪk vɛnt/
An atmospheric vent is a venting system used in gas water heaters to safely expel combustion gases to the outdoors. It relies on natural draft, where hot gases rise through a vertical vent pipe without a fan. Proper sizing and adequate combustion air are essential to prevent backdrafting, which can allow gases like carbon monoxide to enter living spaces.
What does an atmospheric vent do?
It vents combustion gases from a gas water heater to the outdoors using natural draft, helping prevent dangerous fumes indoors.
Source: The Cooling Company
Atmospheric venting uses natural draft to move combustion gases outside.
Many homes use atmospheric vent water heaters because they are simple and cost-effective, especially when vertical venting to the outdoors is readily available.
Have your venting system inspected for blockages, leaks, or corrosion to keep your water heater safe and efficient.
“Have your venting system inspected for blockages, leaks, or corrosion to keep your water heater safe and efficient.”
Modern atmospheric vent designs include added safety features to reduce backdraft risks and meet stricter building codes.
How do I know if my atmospheric vent is backdrafting?
Signs can include soot around the draft hood, stale air, or unusual odors. A professional test is the safest way to confirm.
Can an atmospheric vent be installed sideways?
No. Atmospheric venting relies on vertical rise for natural draft, so the vent must run upward to the outdoors.
Is an atmospheric vent less efficient than other types?
Often yes. Natural draft systems can lose more heat up the vent compared to direct-vent or power-vent options.
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