Open Flue Box

I understand the opening at the bottom of old boiler flue boxes. This is the first time I have seen one with the end open. It did have good draft. It just does not seem right. What do you guys think?


Dude, it’s a mail box:shock:

My first thought is, did you test the operation with a CO detector around the boiler?
Any measurement of CO will make me designate a qualified contractor to take a look.
Is that a block flue that it is conected to?

Yes, but I could not tell if it was lined.

**No. It’s not right. With draft hood T’d like that the gases will spill out until draft is established. Call your mechanical code inspector for their interpretation of IMC 2006. **

Write it up for HVAC company to look at.