why does my chimney have 2 openings on top?

Question

i'm assuming this is a second flue, but why is there a need for a second one. also should i get a multi flue cap or 2 singles?

Answer 1

There are two separate flues going up your chimney. One may be for a wood burning fireplace and the other for the oil or gas burner that provides your main heat.

The multi-flue cap is easier to install and looks better up there.

Answer 2

SOMETIMES IT JUST CODE.
other times, it to prevent , one from gettiing blocked u p