cold direct vent
I have a Heatilator direct vent that was part of our new house built last fall. This past weekend, it was 0 degrees outside, 3o degrees at the hearth and 22 in the lower box of the fireplace.
Builder and Installer say this is normal for all direct vents, as the flue is always open to the outside. I think it doesn't sound correct. It is installed in a bumpout. I know the back wall and sides are insulated and drywalled. But, the deck/hearth it is sitting on, not sure that is insulated.
Looking for any advice here.