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The round metal HVAC ducts are sealed with mastic at all joints and seams.

The round metal HVAC ducts are sealed with mastic at all joints and seams.
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The sealed, insulated crawlspace is a clean, dry location to house the main floor heating ducts and also provides bonus storage space.

The sealed, insulated crawlspace is a clean, dry location to house the main floor heating ducts and also provides bonus storage space.
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The seam between this duct register and the wood flooring is sealed with caulk to prevent air leakage into the house from the crawlspace below.

The seam between this duct register and the wood flooring is sealed with caulk to prevent air leakage into the house from the crawlspace below.
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The seams in this HVAC duct are sealed with mastic.

The seams in this HVAC duct are sealed with mastic.
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The single strap cannot support the bend and is nearly severing the flex duct

The single strap cannot support the bend and is nearly severing the flex duct
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The tape is covered with mastic to ensure an airtight seal between the duct and the fitting

The tape is covered with mastic to ensure an airtight seal between the duct and the fitting
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The test fan for this central ERV duct leakage test is connected to the duct system from inside the ERV cabinet

The test fan for this central ERV duct leakage test is connected to the duct system from inside the ERV cabinet
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The test fan for this rooftop duct test is connected to the central exhaust duct via a transition plate at the rooftop curb

The test fan for this rooftop duct test is connected to the central exhaust duct via a transition plate at the rooftop curb
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The unsealed register boot is going through the side wall of the chase

The unsealed register boot is going through the side wall of the chase
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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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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 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 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 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.