Posted 6/13/2009 13:09 (#743747 - in reply to #743681) Subject: RE: Lets talk insulation . . spray foams and blown types ~
E.Central MN
I'm pretty sure that a fresh air intake to the furnace is required here in Minnesota. As houses get tighter and tighter it is necessary to prevent a negative pressure situation where the furnace could draw air back down the stack endangering the occupants of the house. With all of the concern about clean air it is a no-brainer to install an insulated duct to bring outside air in to fuel type furnaces and water heaters.