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Video:

Duct Leakage to Outdoors (2)

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Duct pressure is checked at key locations such as individual bath exhaust registers to ensure there is even pressure distribution in a duct system during a duct leakage test

Duct pressure is checked at key locations such as individual bath exhaust registers to ensure there is even pressure distribution in a duct system during a duct leakage test
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Duct pressure is checked at terminal registers to ensure there is even pressure distribution in a duct system during a duct leakage test

Duct pressure is checked at terminal registers to ensure there is even pressure distribution in a duct system during a duct leakage test
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Ductless Heat Pump Outside Compressor

Ductless Heat Pump Outside Compressor
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Ductless heat pump’s digitally controlled inverter compressor

Ductless heat pump’s digitally controlled inverter compressor
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Ductless indoor units like this one are controlled individually by handheld remote controllers.

Ductless indoor units like this one are controlled individually by handheld remote controllers.
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Ducts should not be located in exterior wall cavities

Ducts should not be located in exterior wall cavities
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ECM Motor and Control

ECM Motor and Control
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ECM Motor Retrofit

ECM Motor Retrofit
Video:

Encapsulated Ducts

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Equations for calculating duct cross-sectional area for round and rectangular ducts; area is used with measured velocity to calculate airflow

Equations for calculating duct cross-sectional area for round and rectangular ducts; area is used with measured velocity to calculate airflow
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Equipment needed to pressure test the airtightness of walls separating the house from an attached garage

Equipment needed to pressure test the airtightness of walls separating the house from an attached garage
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Evaporative Cooler Sizing in ACH based on wet-bulb temperatures at 1% summer design conditions

Evaporative Cooler Sizing in ACH based on wet-bulb temperatures at 1% summer design conditions
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Example calculation of the leakage allowance for a duct leakage test at final for a ventilation system in a multifamily building

Example calculation of the leakage allowance for a duct leakage test at final for a ventilation system in a multifamily building
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Example calculation of the leakage allowance for a duct leakage test at rough-in for a ventilation system in a multifamily building

Example calculation of the leakage allowance for a duct leakage test at rough-in for a ventilation system in a multifamily building
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Example calculations for converting measured leakage airflow and leakage allowance when measured at a pressure other than the design or operating pressure

Example calculations for converting measured leakage airflow and leakage allowance when measured at a pressure other than the design or operating pressure
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Example calculations for converting total airflow and leakage allowance when measured at 50 Pa instead of the design or operating pressure

Example calculations for converting total airflow and leakage allowance when measured at 50 Pa instead of the design or operating pressure
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Example calculations for leakage allowance when testing only a portion of the ducts in a central exhaust system

Example calculations for leakage allowance when testing only a portion of the ducts in a central exhaust system
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Example design airflow data for a ventilation system in a multifamily building

Example design airflow data for a ventilation system in a multifamily building
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Example design airflow data for the supply and exhaust registers of a ventilation system in a multifamily building

Example design airflow data for the supply and exhaust registers of a ventilation system in a multifamily building
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Example duct length calculations for a multifamily central exhaust system

Example duct length calculations for a multifamily central exhaust system
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Example expanded performance table from a 1.5-ton air conditioner

Example expanded performance table from a 1.5-ton air conditioner
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Example of a gas furnace with no signs that the furnace has backdrafted in the past; there is clean shiny metal all around the burner tubes.

Example of a gas furnace with no signs that the furnace has backdrafted in the past; there is clean shiny metal all around the burner tubes.
Video:

Exhaust Ventilation Testing