i agree also,i dont see how <300 from a door/window/vent can be ntcs but a rubber collar ar..must be to stop people poking them through 12" square flues and not bricking them up
How can a boiler installer manage to spell all three boiler manufacturers wrongly?
I am also surprised that you have managed to get your screen name on here with spaces. I am sure when I originally tried to do that it did not allow me. Did you use any special characters?
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