Welcome! Here are the website rules, as well as some tips for using this forum.
Problematic vent in Attic Space
I have a problematic vent in an unheated attic space. There is a riser that runs from the basement to the second floor, and feeds one radiator, it then makes a turn and runs about 8' through an adjacent unheated attic space. I find it odd that it is only tapped for an 1/8 vent. When we moved in there was a hoffman vent that just spewed out steam and never closed, I replaced that with a Gorton that has since gone bad, and now a maid-o-mist has gone bad. This is a problem because nobody can tell that its leaking until I climb into the attic and see while the system is at full steam.
I'm thinking the more extreme temperature changes are hard on the vents in here and causing them to go bad quickly, I do not have this issue with other vents in the house.
I don't seem to have an excess of pressure as my pressure-tool is set to 1.5 psi, and per my PSI gauge it does cut out around there.
Does anyone have a recommendation for a vent that would hold up better in this space? I was debating about a big mouth since it is a pretty long run to get there, but since its only a 1/8" opening I would need a few reducers and I'm not sure how well that would work. I've also thought about just plugging this tap but since this radiator is actually the first one to heat upstairs and is nice and quiet, there does seem to be value in it being vented.