I am constructing a new, wood framed and sheathed chimney chase that houses a 6″ B-vent for a boiler and a 6″direct vent for a zero clearance gas fireplace heater.
All manufacturer clearances have been observed. Given that the chase faces the prevailing winds it is more exposed to more extreme temperature changes and I am concerned about condensation inside the chase. I have considered lining the chase with a layer of non combustible 1 1/2″fire blanket. Does this make any sense in reducing potential condensation and/or reducing drafts when the fireplace is not in use? How tight should a chase be? Or should the chase be vented? What about all that wonderful heat that is radiating off the vent piping during operation? In theory it is should be clean (i.e. no monoxides, etc…) so can it be revented for heating purposes? Thanks
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Personal opinion....if I'm following what you mean....insulate only the surfaces that contact the heated space of the home. Allow the chase to "breath".
J. D. Reynolds
Home Improvements