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Trunk to duct connections are only mechanically fastened and not sealed

Trunk to duct connections are only mechanically fastened and not sealed
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Trunk to duct connections are properly insulated and have been sealed with mastic

Trunk to duct connections are properly insulated and have been sealed with mastic
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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
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Typical coaxial coil (liquid-to-refrigerant heat exchanger) used in a ground-source heat pump

Typical coaxial coil (liquid-to-refrigerant heat exchanger) used in a ground-source heat pump
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Typical ground-source plumbed system

Typical ground-source plumbed system
Video:

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

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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 dust brush attachment on your vacuum cleaner to clean the air filters of your heat pump water heater

Use the dust brush attachment on your vacuum cleaner to clean the air filters of your heat pump water heater
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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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
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Ventilation in this dwelling unit is provided by an Energy Recovery Ventilator; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake; conditioned air is provided by an air handler

Ventilation in this dwelling unit is provided by an Energy Recovery Ventilator; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake; conditioned air is provided by an air handler
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Ventilation in this unit is provided by an Energy Recovery Ventilator; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake; conditioned air is provided by an air handler and dehumidification is provided separately

Ventilation in this unit is provided by an Energy Recovery Ventilator; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake; conditioned air is provided by an air handler and dehumidification is provided separately
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Ventilation inlet does not terminate high enough above the roof deck

Ventilation inlet does not terminate high enough above the roof deck