Hole in boiler ventilation ductwork

Specific Inspection Topics Inspecting HVAC Systems
1

I found this pencil sized hole in the side of the flue pipe. This may sound like a dumb question, but wouldn’t this be considered a safety hazard for carbon monoxide? I’ve heard of people drilling holes in the side of them to gain access to the inside for testing purposes, but this hole appears a little large for that.

Regards,

Steve

IMG.jpg
IMG.jpg800×600 76.8 KB

2

That hole is for the Service Mechanics to stick their proble in for checking the combustion test, like CO2, stack temperature. Harmless.:):smiley:

3

Thanks. I started searching the forum after I made that post and found exactly what you were describing.

Regards,

Steve