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Home » Authors » Eric Kjelshus

Articles by Eric Kjelshus

During each short cycle of the boiler, the chimney would stay wet and drip water. Those drips fell onto the basement rim joists, found a 1-inch steel gas pipe, and the pipe started to rust and leak gas.

Why You Always Test for Gas Leaks When Touching any Part of a Building

Who would have thought that an unsightly chimney provided clues to the source of a hidden gas leak?
Eric Kjelshus
June 8, 2015
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On a recent call to replace an aging gas boiler, the owners reported a persistent gas smell. The gas company had previously inspected the building and couldn’t find a leak. Yet the smell continued. The point is, if you smell gas, however subtle the smell, there is a gas leak. Somewhere. The challenge can indeed be where to find it.


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For Category I venting, use "B" vent as the connector from the appliance to the flue.

Chimney Fundamentals: The Science of Venting Flue Gases - Part 3

How to Keep Your Customers Safe as Well as Comfortable
Eric Kjelshus
April 20, 2015
One Comment

Water is a byproduct of combustion. If the proper venting of flue gases is neglected — as is so often the case — water in the form of condensation triggers serious safety and comfort issues for our customers. As professionals, we must pay more attention to flue gas temperatures and the conditions of the flue during our service calls.


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Positive pressure condensing appliances use Category IV vents which can be PVC or CPVC.

Chimney Fundamentals: The Science of Venting Flue Gases - Part 2

How to Keep Your Customers Safe as Well as Comfortable
Eric Kjelshus
January 19, 2015
One Comment

Gas appliances are divided into four venting categories based on vent operating pressure and whether they are condensing or non-condensing. Category I is negative pressure, non-condensing. Category II is negative pressure, condensing. Category III is positive pressure, non-condensing. Category IV is positive pressure, condensing.


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This water heater has been back drafting for 11 years.

Chimney Fundamentals: The Science of Venting Flue Gases - Part 1

How to Keep Your Customers Safe as Well as Comfortable
Eric Kjelshus
October 20, 2014
One Comment

This multiple-part article series will discuss the basics, codes and standards, and the science behind chimneys. It will show how back drafting affects chimney performance, while explaining the principles of positive pressure. It will explain how to create and use positive pressure so chimneys will draft for safety and performance.


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