I have an unfinished attic I rarely go in, but recently went in and noticed the duct for the gas furnace/ water tank is corroded where it goes through the roof sheathing. It has pin holes in it, so metal taped it, until it can be replaced.
This was probably done 20 years or so ago by professional HVAV people who installed the furnace. But now even question if it was legal with what they did? I have flexible line going up in clay duct, which the clay duct is incased in asbestos, and where the flex line comes out there is about 1 foot of corroded duct before it goes through the roof sheathing to the stack?
First to me this corroded section looks like C duct, which I question if even legal? And secondly there's minimal clearance between the duct and sheathing too? Although at this distance from the furnace I checked, and I can lay my hand on it with the furnace running and the duct does not get that hot.
Not sure if this duct runs through the flashing boot and is also the stack too? as I haven't been on the roof yet? But looks like this 1-foot section of duct could be secured to the stack up under the flashing boot possibly but can't really see up the duct to where it exits the flashing from looking through the sheathing gap where the duct goes through from the attic.
Question this is a 5inch duct that is corroded, can I remove it without messing with the flashing and shingles? As there is no leakage at the roof area, and this will all be redone correctly at next new roof coming up in a few years or so.
Could I get approx. a 3 foot section of B duct, a storm collar, and adapter to hook the flex line too? These 3 feet of b duct would replace the 1-foot corroded section, within the attic peak going through the sheathing, as the addition 2 feet to make the stack up?
And if so what kind of connecter is needed from the b duct to hook on the flexible duct, all I see are draft hood collars? Thanks
This was probably done 20 years or so ago by professional HVAV people who installed the furnace. But now even question if it was legal with what they did? I have flexible line going up in clay duct, which the clay duct is incased in asbestos, and where the flex line comes out there is about 1 foot of corroded duct before it goes through the roof sheathing to the stack?
First to me this corroded section looks like C duct, which I question if even legal? And secondly there's minimal clearance between the duct and sheathing too? Although at this distance from the furnace I checked, and I can lay my hand on it with the furnace running and the duct does not get that hot.
Not sure if this duct runs through the flashing boot and is also the stack too? as I haven't been on the roof yet? But looks like this 1-foot section of duct could be secured to the stack up under the flashing boot possibly but can't really see up the duct to where it exits the flashing from looking through the sheathing gap where the duct goes through from the attic.
Question this is a 5inch duct that is corroded, can I remove it without messing with the flashing and shingles? As there is no leakage at the roof area, and this will all be redone correctly at next new roof coming up in a few years or so.
Could I get approx. a 3 foot section of B duct, a storm collar, and adapter to hook the flex line too? These 3 feet of b duct would replace the 1-foot corroded section, within the attic peak going through the sheathing, as the addition 2 feet to make the stack up?
And if so what kind of connecter is needed from the b duct to hook on the flexible duct, all I see are draft hood collars? Thanks
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