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Vent size reduction from appliances to connector and chimney liner

Hi everyone,

I'm a 1st time homeowner and my chimney recently needed to be relined (blockage had caused boiler to turn off).

We have 2 appliances - a 40K BTU Water Heater and a 187K BTU Boiler. The boiler has a 7" exhaust and the water tank has a 4" exhaust. The Chimney height is 35-40 ft.

The chimney guy that came installed a double walled 5.5" smoothwall flex stainless steel chimney liner. He also installed a 6 inch connector coming off the boiler (reduced from 7" exhaust), and again reduced at the chimney liner to 5.5".

He insists that he's been in the business for over 20 years and everything was done correctly.

Anyone have experience with this?

Thank you in advance!


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