![A gas central heating flue blocked with snow in a British winter causing the central heating to not work Stock Photo - Alamy A gas central heating flue blocked with snow in a British winter causing the central heating to not work Stock Photo - Alamy](https://c8.alamy.com/comp/DC0HH0/a-gas-central-heating-flue-blocked-with-snow-in-a-british-winter-causing-DC0HH0.jpg)
A gas central heating flue blocked with snow in a British winter causing the central heating to not work Stock Photo - Alamy
![BrayTile Company 🚰 on Twitter: "Gas boiler call-out found Painter had left boiler flue blocked with masking tape preventing supply of intake air. A blocked flue can cause deadly Carbon Monoxide back BrayTile Company 🚰 on Twitter: "Gas boiler call-out found Painter had left boiler flue blocked with masking tape preventing supply of intake air. A blocked flue can cause deadly Carbon Monoxide back](https://pbs.twimg.com/media/DOWHBTBW0AA5yAg.jpg)
BrayTile Company 🚰 on Twitter: "Gas boiler call-out found Painter had left boiler flue blocked with masking tape preventing supply of intake air. A blocked flue can cause deadly Carbon Monoxide back
![Flue gases and combustion product hazards from heating appliances: heating oil combustion gases, LP gas combustion gases Flue gases and combustion product hazards from heating appliances: heating oil combustion gases, LP gas combustion gases](https://inspectapedia.com/chimneys/Metal_Flue298-DFs.jpg)