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The hole in the air handler box, on left, was covered with a piece of 30-gauge sheet metal that was cut to size and sealed in place with screws and mastic.

The hole in the air handler box, on left, was covered with a piece of 30-gauge sheet metal that was cut to size and sealed in place with screws and mastic.
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The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.
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The HVAC ducts are properly supported with wide straps spaced close together.

The HVAC ducts are properly supported with wide straps spaced close together.
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The inner liner of the flex duct is fastened to the collar with a tension tie, the connection is sealed with mastic, then the outer layer is pulled over and sealed with mastic or foil tape (Steven Winter Associates 2013).

The inner liner of the flex duct is fastened to the collar with a tension tie, the connection is sealed with mastic, then the outer layer is pulled over and sealed with mastic or foil tape (Steven Winter Associates 2013).
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The joints in the ducts and air handler are sealed with mastic.

The joints in the ducts and air handler are sealed with mastic.
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The jump duct should be insulated and sealed at registers

The jump duct should be insulated and sealed at registers
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The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.

The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.
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The location of furnace and water heater flues can be identified by going outside and looking for metal pipes coming through the roof.

The location of furnace and water heater flues can be identified by going outside and looking for metal pipes coming through the roof.
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The main trunk line of the ducts runs within an insulated duct chase installed in a notch designed into the roof trusses that runs the length of the home to provide supply air directly to most of the home’s ceiling registers.

The main trunk line of the ducts runs within an insulated duct chase installed in a notch designed into the roof trusses that runs the length of the home to provide supply air directly to most of the home’s ceiling registers.
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The manometer hose for a duct leakage test is connected to a static pressure probe which will be inserted into a duct with the tip pointing into the oncoming air stream

The manometer hose for a duct leakage test is connected to a static pressure probe which will be inserted into a duct with the tip pointing into the oncoming air stream
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The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow

The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow
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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.