Combustion Safety Testing

furnace testing

Most homes are now equipped with standard carbon monoxide (CO) and smoke detection alarms for home safety. These detectors give families warnings when fire breaks out or unsafe levels of CO gases build up. A Wisconsin Home Improvement combustion safety test looks at the mechanical appliances that burn natural gas or fuel oil to ensure that dangerous gases, including carbon monoxide, are properly vented outside the home.

What is a Combustion Safety Test?

A combustion safety test involves a creating a "worst-case depressurization" to determine if any combustion appliances are leaking gas into the home. The appliances are turned to a "pilot" mode for testing. All windows and doors are shut tight for the test. Then, to create the "worst-case depressurization," all exhaust fans and the clothes dryer are turned on. First, our professionals test the airflow in each flue using a DG-700 pressure and flow gauge. We also test spillage or gas leakage from any open burners.

When is a Combustion Safety Test Conducted?

This test of your furnace or boiler safety can be conducted at any time, and is one of the components of Wisconsin Home Improvement's comprehensive home performance audits. The test is needed only when there are appliances that burn a fuel—natural gas or propane— to provide heat. Units that need testing include:

  • Furnaces
  • Water heaters
  • Boilers
  • Cooking stoves

Our auditors will first visually inspect any flues attached to these appliances to determine if they are installed properly.

How is Carbon Monoxide Gas Detected?

To detect the amount of carbon monoxide levels that may be leaking in under these
"worst-case" conditions , our WHI combustion testers will first collect a sample of air from outside the home to calibrate the detection monitor. Then we'll test the ambient air inside the combustion appliance zone. These tests are only conducted on open burner appliances; appliances with sealed combustion do not need testing.

If your furnace more than ten years old or you have concerns about the safety of your combustion appliances, call Wisconsin Home Improvement! You'll get peace of mind knowing your furnace and water heater are safe and functioning properly.


Keep your combustion appliances running safely!

We offer professional equipment testing.


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  • Teresa

    I am so grateful for everyone at Wisconsin Home Improvement. I will always recommend you to anyone looking to have insulation services.

  • Jenny P.

    I just wanted to extend a thank you to you and all of your employees who have spent time at our home fixing our attic issues.

  • James V.

    Dear Steve, 

    We at Grace are so pleased with the quality of work and the professionalism of the crew that did the insulation. Mike and Igor were so respectful of the building and its contents, and so nice to everyone in the congregation who was working at church. 

    James V., Milwaukee, WI
  • Cindy S.

    I really feel compelled to give a "shout out" to everyone I have come into contact with at WHI. First off - Jody. You are so friendly and helpful on the phone, forgiving me for my inability to "on-line sign", switching up of dates, declining work and then changing my mind.

    Cindy S., Whitefish Bay, WI
  • Tim S.

    Steve, just a side note and I would not send this if it was not completely true - Mike and Pete were both fantastic. I was impressed. We had just had other major construction and have many comparatives for the work WHI did. I would come home and never know they had even been there.

  • Mike & Erin M.

    We wanted to provide feedback on our experience with Peter, who did our home energy audit.  We felt he went above and beyond what was expected of him.  He was very thorough and was genuinely concerned about any issues causing inefficiencies in our home.  He explained things in terms we... Read More

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    great work you did and insulating our home. It is only been a week, and the
    difference is amazing. Every room in this house feel substantially warmer.

  • Your employees were prompt, courteous and friendly.

    Lois W., Menomonee Falls, WI
  • Thursday and Friday of last week one of your crews were at my home putting in some additional insulation and doing some other work. I just wanted to tell you that my wife and I were very impressed with the professionalism of your men.

    John & Jennifer P., WI
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    JoAnne and Jan V., Greendale, WI
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    Ryan, WI
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    Jim Young, WI
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    Eugene Hefter, WI
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    Brandon Langeteig, Project Home, Inc.
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