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I used one company when i first bought my house who also looked into the vent for my oil boiler (without telling me) and put stuff into the vent. He then called me over and said "hey, look at all this stuff. You need a new liner! You are gonna die of CO poisioning!!"
He then tried to sell me an 800 dolalr new liner. He wasnt happy that I told him i was going to call Slomin's to take a look.
Sure enough when Slomins came they looked up the vent and said "Your liner is fine, he was trying to scam you."