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Why do you need a pressure blower door & thermal imaging test?

15 Mar
Why do you need a pressure blower door & thermal imaging test?

Air tightness and blower door tests are performed to highlight air gaps and thermal bridging within the building envelope from walls, floors, roofs, doors, windows, skylights and any other openings.

What is a blower door?

A blower door machine is used to measure the air tightness of buildings (infiltration rate of building), measuring air flow between building zones and to test ductwork air tightness.

  1. You can take the following steps to prepare for a blower door test:
  2. Clean all fireplaces and close the flues
  3. Point out the drafty areas to the auditor
  4. Make sure auditor has total access to your home including closets, attics, crawl spaces and/or empty rooms
  5. Close all the exterior windows and open all interior doors
  6. Turn off all the fossil fuel appliances such as gas stoves, etc.

The test will take up to two hours.

Some descriptions of building and air tightness respectively:


What is thermal imaging test?

Thermal imaging highlights areas where your home is losing heating or cooling. Below are some images to show you examples of thermal imaging tests in homes:

This image shows the evaporative cooler turned off in summer and a house under pressurization. The orange / red area shows the hot air getting in from ceiling cavity. [Source: Efficiency Matrix]

Cold air is getting in from a crack above the door in an internal wall.

[Source: Efficiency Matrix]


A hot ceiling is radiating into hallway in summer time. This is due to lack of insulation which creates a thermal bridge.

[Source: Efficiency Matrix]


How much does a blower door test cost?

The blower door and thermal imaging test can cost between $700-$800 depending on the nature and type of the build.

Get in touch with us to arrange a blower door test for your build through one of our partners.         

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