The Fireplace Blower Door Test The Fireplace Blower Door Test

The fireplace door test is done to check the air tightness of an area. Professional energy auditors initiate door tests in order to ensure that the fireplace and other related components will not damage the house or harm those living in it. There are several reasons why proper building tightness should be verified:

  • Energy consumption (in this case the use of resources for the fireplace) can be significantly reduced when any air leakage is dealt with.
  • Moisture condensation problems can be avoided when proper tightness is achieved.
  • Air leakage from the outside can cause a cold and uncomfortable draft. Proper air tightness can help avoid a draft.
  • Fireplace blower door tests also ensure that the quality of the air is not contaminated. When air tightness is incorrect, indoor air pollution can contaminate the house.

How Does Fireplace Blower Door Test Works

The Fireplace Blower Test Door is very easy to perform. The test is usually finished in half an hour to one hour, max. The blower test uses a large, unique variable-speed fan that is placed on top of a panel and then momentarily fixed into an exterior opening. Once the fan for the blower test is turned on, air pressure inside the area is slowly decreased. Outside air then slowly enters the house.

Air Pressure

Usually, air comes inside through unsealed openings and cracks and suddenly becomes evident. When the cracks and openings appear, it’s easier to find the air leaks and measure the damage. Air leaks are measured by the different gauges that come with the fan. The gauges calculate both the resistance of the area to air filtration as well as the airflow’s rate. The fan used in the fireplace blower test drives the air out. When this happens, the air pressure of the house inside is greatly reduced. The higher air pressure outside moves inside the openings and cracks. In order to find the air leaks a smoke pencil is also used. This helps determine the rate of air filtration inside the structure. Airflow is specifically measured using a manometer and hoses.

Types of Doors

Blowers used for tests come in two different types: calibrated and uncalibrated. For auditors, it is essential that a calibrated door is used. Calibrated doors use different kinds of meters to measure the air pressure driven out of the building. Uncalibrated blower doors are only capable of determining leaks in homes. Calibrated doors allow auditors to fully measure air leakage amount so as to determine the efficiency of air-sealing solutions.

Blower Door Test Preparations

There are several measures people inside the structure should do before a blower test can be done:

  • Windows should be closed while interior doors should be opened.
  • The thermostats on any kind of heater inside the structure should be turned down.
  • Place damp newspapers in the wood stoves and fireplaces so that ashes will not scatter.
  • Fireplace doors and related structures should be closed.

Blower test providers offer different kinds of services and packages. Depending on the provider and length of time the test takes, the project price may vary.

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