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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 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 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 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 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