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Presentation:

Whole House Mechanical Ventilation Options

Whole House Mechanical Ventilation Options
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Whole house ventilation ensures adequate indoor air quality

Whole house ventilation ensures adequate indoor air quality
Video:

Whole-Building Delivered Ventilation

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Whole-house fans draw outside air through windows into the home and exhaust it into a vented attic

Whole-house fans draw outside air through windows into the home and exhaust it into a vented attic
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Whole-house fans or wind-driven cross ventilation can be used to draw air across thermal mass for a night flush strategy

Whole-house fans or wind-driven cross ventilation can be used to draw air across thermal mass for a night flush strategy
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With exhaust-only ventilation, the building is under negative pressure

With exhaust-only ventilation, the building is under negative pressure
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With supply-only ventilation, the building is under positive pressure

With supply-only ventilation, the building is under positive pressure
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Without an exhaust fan ducted to the exterior, particles resulting from cooking can accumulate on walls and ceilings, and will be present in the air where they can damage occupants' respiratory systems

Without an exhaust fan ducted to the exterior, particles resulting from cooking can accumulate on walls and ceilings, and will be present in the air where they can damage occupants' respiratory systems
Video:

Wood Tornado Shelters Segment 6

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Wrong - An open eave with no soffit covering can trap rising hot air and embers from a wildfire.

Wrong - An open eave with no soffit covering can trap rising hot air and embers from a wildfire.
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Wrong - Bathroom fan should have enough suction to hold a tissue.

Wrong - Bathroom fan should have enough suction to hold a tissue.
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Wrong - Cold spots along the top plate combined with lack of ventilation have encouraged mold growth along this bathroom ceiling.

Wrong - Cold spots along the top plate combined with lack of ventilation have encouraged mold growth along this bathroom ceiling.
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Wrong - Construction materials show signs of mold.

Wrong - Construction materials show signs of mold.
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Wrong - Exhaust fans should not have tight bends in duct work, especially right next to the fan as this can block airflow

Wrong - Exhaust fans should not have tight bends in duct work, especially right next to the fan as this can block airflow
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Wrong - Exhaust pipe is not vertical; poorly installed roofing; roofing odd placement for gable vent.

Wrong - Exhaust pipe is not vertical; poorly installed roofing; roofing odd placement for gable vent.
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Wrong - If the soffit is applied directly to the rafter eave, it forms a sloping soffit, which creates a pocket that can trap hot air and embers from a wildfire.

Wrong - If the soffit is applied directly to the rafter eave, it forms a sloping soffit, which creates a pocket that can trap hot air and embers from a wildfire.
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Wrong - Lack of insulation in the wall above this window combined with poor bathroom ventilation has contributed to mold growth.

Wrong - Lack of insulation in the wall above this window combined with poor bathroom ventilation has contributed to mold growth.
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Wrong - Poor ventilation has encouraged the build up of mold in this shower.

Wrong - Poor ventilation has encouraged the build up of mold in this shower.
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Wrong - Terminate exhaust fan ducts outdoors, not "near" the outdoors

Wrong - Terminate exhaust fan ducts outdoors, not "near" the outdoors
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Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.
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Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.

Wrong - Vent hole has no cover or screening and is poorly sealed and flashed to siding.
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Wrong – A tear in the outer jacket of this duct shows where an in-line airflow measurement was made; the inner duct was not sealed and created a duct leak.

Wrong – A tear in the outer jacket of this duct shows where an in-line airflow measurement was made; the inner duct was not sealed and created a duct leak.
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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.