Carbon Monoxide and Your Hampshire Fireplace: What You Need to Know

Carbon monoxide is odorless, colorless and dangerous, and any fuel-burning appliance can produce it. Your chimney’s entire job is to carry it safely out of the home — and keeping it doing that job is the core of CO safety for a Hampshire household.

How chimneys keep you safe

Wood, gas and oil appliances all produce carbon monoxide as a byproduct of combustion. A properly working chimney or vent carries those gases up and out, above the home. When the venting works, CO is a non-issue; when it fails, that gas has nowhere to go but back into the living space.

What causes CO to back up

The usual failures are a blocked flue — from creosote, debris or a nest — a cracked or deteriorated liner that lets gases escape into the structure, a failing seal, or a downdraft that reverses the flow. High-efficiency appliances vented into an oversized or unlined flue can also condense and corrode, opening paths for gases to leak.

The role of a yearly inspection

An annual inspection confirms the flue is clear and the liner is intact — the two things that keep exhaust going up and out. It is the front line of CO safety for any fuel-burning home, because it catches a venting problem before it becomes an exposure.

Alarms are the backstop

Put a working carbon-monoxide alarm on every level of the home and near sleeping areas, and test them monthly. Keep them a reasonable distance from the fireplace to avoid nuisance trips. Alarms do not replace a sound chimney — they catch a failure the moment it happens, when you might not.

Know the symptoms

CO poisoning mimics the flu: headache, dizziness, nausea and fatigue that tend to ease when you leave the house and return when you come back. That pattern is the tell. If you suspect it, get everyone outside into fresh air and call for help.

Two layers of protection

For the fuel-burning homes around Hampshire, safety comes from two habits together: an annual inspection that confirms clear venting, and tested CO alarms as an independent backstop. Neither replaces the other, and together they make a fuel-burning household genuinely safe.

Placing and testing your CO alarms

An alarm only protects you if it is placed and maintained right. Put a carbon-monoxide alarm on every level of the home and near sleeping areas so it will wake you overnight, and keep them a sensible distance from the fireplace and kitchen to avoid nuisance trips. Test them monthly, replace the batteries on schedule, and replace the units themselves every five to seven years, since the sensors wear out. Combined with the yearly chimney inspection that keeps venting clear, tested alarms are the layer that protects a Hampshire household when something goes wrong unexpectedly.

Published October 9, 2026 · Imperial Chimney Sweepers, DeKalb, IL