Blower Door Test Safety Overview 
For Electric & Natural Gas Customers

A blower door test is used by energy auditors to measure the air leakage into and out of your home or building giving an indication how airtight the structure is. The goal of a blower door test is to locate air leaks around:

  • windows
  • doors
  • attics
  • basements
  • light sockets
  • light fixtures   
    • electrical outlets
    • piping
    • cables
    • dampers
    • vents
    • other openings to the outside

    The test uses a small powerful fan that fits into an aluminum frame snuggly placed into your entrance door opening. The fan pulls air out of the structure putting a vacuum on your home or building creating a differential equal to a 20 mph wind hitting your structure. Since the powerful blower door fan is pulling air out, any new fresh air enters through cracks, holes, dampers, vents, and other openings in the structure allowing the auditor to locate and identify each leak. Some of the leaks or drafts entering the structure can often be felt with the hand. An auditor will identify each leak in the audit report and make recommendations on what corrective measures can be taken to stop the drafts and start saving energy.

    It is often assumed that poorly sealed windows and doors are the major culprits of air leaks. In reality, leaks in other areas are usually more significant such as in the basement, crawl spaces and attics.

    For more information about residential energy audits, visit the Department of Energy website.

    The link provided below goes to a web page with a video mainly produced by third parties to educate a public audience.

    Blower Door Test, air leakage, air drafts, air leaks, air leak
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