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Image:

Two exhaust fan vents (with angled hoods) are visible on the roof and another exhaust vent (with angled hood) is visible on the wall of this home.

Two exhaust fan vents (with angled hoods) are visible on the roof and another exhaust vent (with angled hood) is visible on the wall of this home.
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Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake

Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake
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Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic

Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic
Video:

University of Minnesota-NorthernSTAR: A Natural Gas-Fired Combi System for Space Heating and Hot Water

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Use a vacuum brush attachment to clean the exhaust fan motor and blades

Use a vacuum brush attachment to clean the exhaust fan motor and blades
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Use only Underwriters Laboratory UL-181 approved tape

Use only Underwriters Laboratory UL-181 approved tape
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Use the brush attachment on your vacuum to remove dust and debris on the bathroom exhaust fan vents

Use the brush attachment on your vacuum to remove dust and debris on the bathroom exhaust fan vents
Presentation:

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes
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Velocity measurement locations for round and rectangular ducts; velocity measurements should be taken at several locations representative of equal sectional areas across the duct cross-sectional area

Velocity measurement locations for round and rectangular ducts; velocity measurements should be taken at several locations representative of equal sectional areas across the duct cross-sectional area
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Vented Attic vs Unvented Cathedral Attic Air Flow

Vented Attic vs Unvented Cathedral Attic Air Flow
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Vented crawl space with concrete walls and insulated ceiling

Vented crawl space with concrete walls and insulated ceiling
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Vented crawl space with insulation in the ceiling

Vented crawl space with insulation in the ceiling
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Vented crawlspace cripple wall has seismic retrofits – plywood is added on interior that fastens to extra blocking added at sill plate and connected to foundation with new anchor bolts

Vented crawlspace cripple wall has seismic retrofits – plywood is added on interior that fastens to extra blocking added at sill plate and connected to foundation with new anchor bolts
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Vented crawlspace foundation insulated under floor joists with rigid foam.

Vented crawlspace foundation insulated under floor joists with rigid foam.
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Vented range hoods send air through a duct to the outside and recirculating (or ductless) range hoods send air through a charcoal filter and reintroduce cooking air back into the home.

Vented range hoods send air through a duct to the outside and recirculating (or ductless) range hoods send air through a charcoal filter and reintroduce cooking air back into the home.
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Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics

Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics
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Ventilation air inlet is too close to exhaust outlet

Ventilation air inlet is too close to exhaust outlet
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Ventilation air inlet is too close to exhaust outlet

Ventilation air inlet is too close to exhaust outlet
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Ventilation air inlets ≥ 2 ft. above grade or roof deck in Climate Zones 1-3 or ≥ 4 ft. above grade or roof deck in Climate Zones 4-8 and not obstructed

Ventilation air inlets ≥ 2 ft. above grade or roof deck in Climate Zones 1-3 or ≥ 4 ft. above grade or roof deck in Climate Zones 4-8 and not obstructed
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Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust

Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust
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Ventilation air inlets provided with rodent / insect screen with ≤ 0.5 inch mesh

Ventilation air inlets provided with rodent / insect screen with ≤ 0.5 inch mesh
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Ventilation control is not obvious

Ventilation control is not obvious
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Ventilation control is not obvious

Ventilation control is not obvious
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Ventilation duct is compressed because supporting strap is too small

Ventilation duct is compressed because supporting strap is too small