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Image:

Wrong – It is difficult to test the air flow in this fresh air intake duct due to poor access and inadequate length of straight duct to get an accurate in-line flow measurement.

Wrong – It is difficult to test the air flow in this fresh air intake duct due to poor access and inadequate length of straight duct to get an accurate in-line flow measurement.
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Wrong – The damper leading to the ductwork for a central ERV is closed during a duct leakage test; the duct tester is attached to the ERV cabinet, so this will only measure the air tightness of the ERV cabinet and not the duct system

Wrong – The damper leading to the ductwork for a central ERV is closed during a duct leakage test; the duct tester is attached to the ERV cabinet, so this will only measure the air tightness of the ERV cabinet and not the duct system
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Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper

Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper
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Wrong – The open overhang with exposed timbers and unscreened vent holes make this roof more susceptible to ignition.

Wrong – The open overhang with exposed timbers and unscreened vent holes make this roof more susceptible to ignition.
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Wrong – The plastic seal of the open end of this duct is ripped; the test measurement will overestimate the duct leakage if the temporary seals are not very carefully completed

Wrong – The plastic seal of the open end of this duct is ripped; the test measurement will overestimate the duct leakage if the temporary seals are not very carefully completed
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Wrong – The position of this exhaust fan does not allow the duct to route directly outside in as straight a path as possible.

Wrong – The position of this exhaust fan does not allow the duct to route directly outside in as straight a path as possible.
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Wrong – This damper is closed, so the duct system is not entirely pressurized during the duct leakage test

Wrong – This damper is closed, so the duct system is not entirely pressurized during the duct leakage test
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Wrong – This duct boot is not sealed to the wall board

Wrong – This duct boot is not sealed to the wall board
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Wrong – This duct boot is sealed inside the boot for a duct leakage test; this fails to account for the ductwork leakage between the duct boot and the wall board

Wrong – This duct boot is sealed inside the boot for a duct leakage test; this fails to account for the ductwork leakage between the duct boot and the wall board
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Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser

Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser
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Wrong – This exhaust duct extends far beyond what is needed to reach the roof; a short, straight, smooth rigid metal duct is best for exhaust ducts and exhausting to the soffit vent would be preferable.

Wrong – This exhaust duct extends far beyond what is needed to reach the roof; a short, straight, smooth rigid metal duct is best for exhaust ducts and exhausting to the soffit vent would be preferable.
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Wrong – This fire damper is partly closed during a duct leakage test, resulting in an uneven pressure distribution and an inaccurate test result

Wrong – This fire damper is partly closed during a duct leakage test, resulting in an uneven pressure distribution and an inaccurate test result
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Wrong – This kitchen exhaust is a recirculating model; kitchens should use exhaust fans that duct out through the roof to remove moisture and odors from the home

Wrong – This kitchen exhaust is a recirculating model; kitchens should use exhaust fans that duct out through the roof to remove moisture and odors from the home
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Wrong: Single sided ventilation without at least two windows, wing walls, and predictable wind directions is ineffective for generating wind-driven crossflow.

Wrong: Single sided ventilation without at least two windows, wing walls, and predictable wind directions is ineffective for generating wind-driven crossflow.
Video:

Your Northern Home: Air Leakage/ Blower Door Test