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Wrong – Air sealing and fastening of this duct take-off has been damaged during construction, causing a large gap in the right-hand side of the connection that will reduce air delivered to living spaces and make it difficult to balance the system

Wrong – Air sealing and fastening of this duct take-off has been damaged during construction, causing a large gap in the right-hand side of the connection that will reduce air delivered to living spaces and make it difficult to balance the system
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Wrong – Airborne embers can float into holes in damaged vent screens and ignite flammable items in the house or accumulated debris in the vent.

Wrong – Airborne embers can float into holes in damaged vent screens and ignite flammable items in the house or accumulated debris in the vent.
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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 – The stud was cut too long then not installed plumb and level.

Wrong – The stud was cut too long then not installed plumb and level.
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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

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Zero Net Now built this custom for buyer home in the cold climate in New Paltz, NY, and certified it to DOE Zero Energy Ready Home specifications in 2021.

Zero Net Now built this custom for buyer home in the cold climate in New Paltz, NY, and certified it to DOE Zero Energy Ready Home specifications in 2021.