Oil direct vent

camiarrobino

What enables an oil-fired furnace (or boiler) to be direct vented (as opposed to chimney or power vent)? I had thought that direct venting was generally only for high-efficiency condensing natural gas / propane burning machines?

BDR529

Balanced flue with a Riello

EBEBRATT-Ed

Has to be designed to be direct vented with a burner capable of supplying all the air for combustion and pushing it through the boiler passages and through the vent pipe without any assistance from a power venter or draft inducer or chimney.

HVACNUT

You can't just do it because you want to do it. Only on a positive pressure boiler. And your application must meet code and manufacturers specs.
And to be clear, you're not asking about a Power vent, right? Because that's a completely different animal.

Steamhead

I wouldn't consider any type of sidewall venting on oil. If something goes wrong, the outside wall near the vent will get covered with soot. Given the typical "maintenance" we see on oil units, this is more likely to happen than not.