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There are large, unsealed gaps where this HVAC duct penetrates the subfloor to supply a floor register; these gaps should be sealed with spray foam.

There are large, unsealed gaps where this HVAC duct penetrates the subfloor to supply a floor register; these gaps should be sealed with spray foam.
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There should be less than 2.5 inches per each five foot of duct length

There should be less than 2.5 inches per each five foot of duct length
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Thermal and air barriers at rim joist or new blocking prevent Infiltration of unconditioned air into the floor cavity

Thermal and air barriers at rim joist or new blocking prevent Infiltration of unconditioned air into the floor cavity
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Thermosiphon solar hot water system

Thermosiphon solar hot water system
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These ducts are sealed with Underwriter Laboratories-approved metal tape.

These ducts are sealed with Underwriter Laboratories-approved metal tape.
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These ducts were installed within the home's conditioned space in a central chaise down the main hallway.

These ducts were installed within the home's conditioned space in a central chaise down the main hallway.
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These two battery storage modules are charged by a 6 kW solar PV system during daytime hours and provide 27 kWh of whole house backup electricity storage

These two battery storage modules are charged by a 6 kW solar PV system during daytime hours and provide 27 kWh of whole house backup electricity storage
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These two schematics show the plan-view of the same duct system; the upper schematic shows all supply and return outlets and inlets uncovered for normal operation, and the lower schematic shows them covered before beginning a duct leakage test.

These two schematics show the plan-view of the same duct system; the upper schematic shows all supply and return outlets and inlets uncovered for normal operation, and the lower schematic shows them covered before beginning a duct leakage test.
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This “high static ducted cassette” heat pump system is similar to a traditional centrally ducted system, serving several areas of a home from one indoor unit

This “high static ducted cassette” heat pump system is similar to a traditional centrally ducted system, serving several areas of a home from one indoor unit
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This 13.8-kW array of solar panels is mounted on a steel pole with motorized dual-axis rotation to track the sun, maximizing electrical power generation.

This 13.8-kW array of solar panels is mounted on a steel pole with motorized dual-axis rotation to track the sun, maximizing electrical power generation.
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This air register has noticeable gaps between it and the floor; use canned spray foam to fill in the gaps.

This air register has noticeable gaps between it and the floor; use canned spray foam to fill in the gaps.
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This bath fan duct actually has a termination vent attached at the end of the duct but the vent is sitting on the attic floor instead of attaching through the roof so humid air is exhausting into the attic

This bath fan duct actually has a termination vent attached at the end of the duct but the vent is sitting on the attic floor instead of attaching through the roof so humid air is exhausting into the attic
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This bath fan is ducted through the roof but the ducting is so excessively long that air flow is likely to be very poor

This bath fan is ducted through the roof but the ducting is so excessively long that air flow is likely to be very poor
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This builder installed a PV panel awning over his multifamily project in San Francisco.

This builder installed a PV panel awning over his multifamily project in San Francisco.
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This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow

This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow
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This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.

This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.
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This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing

This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing
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This dropped soffit runs the length of the house providing a convenient place to locate one trunk duct with several very short side ducts that supply heat and cooling to most rooms of the house.

This dropped soffit runs the length of the house providing a convenient place to locate one trunk duct with several very short side ducts that supply heat and cooling to most rooms of the house.
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This duct became disconnected from the trunk duct because the duct take-off was poorly installed.

This duct became disconnected from the trunk duct because the duct take-off was poorly installed.
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This duct board seam failure is due to the failed tape adhesive.

This duct board seam failure is due to the failed tape adhesive.
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This duct take-off collar had become loose so the sheet metal tabs are being re-bent to make the collar more secure.

This duct take-off collar had become loose so the sheet metal tabs are being re-bent to make the collar more secure.
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This ducted mini-split heat pump was installed in the unvented, conditioned attic and ducted with short duct runs to several nearby rooms.

This ducted mini-split heat pump was installed in the unvented, conditioned attic and ducted with short duct runs to several nearby rooms.
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This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof

This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof
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This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow

This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow