Blower Door

Blower Door

A blower door is a machine used to measure the airtightness of small to medium size buildings. It can also be used to measure airflow between building zones, to test ductwork airtightness and to help physically locate air leakage sites in the building envelope.

There are three primary components to a blower door: (1) a calibrated, variable-speed fan, capable of inducing a range of airflows sufficient to pressurize and depressurize a variety of building sizes, (2) a pressure measurement instrument, called a manometer, to simultaneously measure the pressure differential induced across the face of the fan and across the building envelope, as a result of fan airflow, and (3) a mounting system, used to mount the fan in a building opening, such as a door or a window.

A variety of blower door airtightness metrics can be produced using the combination of building-to-outside pressure and fan airflow measurements. These metrics differ in their measurement methods, calculation and uses. Blower door tests are used by building researchers, weatherization crews, home performance contractors, and others in efforts to assess the construction quality of the building envelope, locate air leakage pathways, assess how much ventilation is supplied by the air leakage, assess the energy losses resulting from that air leakage, determine if the building too tight or too lose, determine if the building needs mechanical ventilation and to assess compliance with building performance standards.

Read more about Blower DoorHistory of Blower Door Testing, How Blower-door Tests Work, Power Law Model of Airflow For Blower Door Testing, Air Density Corrections, Blower Door Metrics, Uses of Blower-door Testing, NFPA Enclosure Integrity Testing

Other articles related to "blower door":

Blower Door - NFPA Enclosure Integrity Testing
... equipment calibration are more rigorous than other types of testing, but any modern blower door equipment is sufficiently accurate to perform NFPA enclosure integrity testing ... The NFPA standard requires that the blower door operator be trained, but does not specify the nature or source of this training ...

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