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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 of an HVAC air filter slot with a latch cover door.

Example of an HVAC air filter slot with a latch cover door.
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Example of an HVAC air filter slot with a sliding cover door.

Example of an HVAC air filter slot with a sliding cover door.
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Exhaust duct only mechanically fastened and not sealed

Exhaust duct only mechanically fastened and not sealed
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Exhaust duct work and penetration to the exterior have been sealed with mastic

Exhaust duct work and penetration to the exterior have been sealed with mastic
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Exhaust duct work and penetration to the exterior have not been sealed

Exhaust duct work and penetration to the exterior have not been sealed
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Exhaust fan ducts should be made of rigid metal ducting not flexible corrugated ducts like these and the ducts should be attached to the roof or soffit to vent completely to the outside not left open in the attic near an attic vent

Exhaust fan ducts should be made of rigid metal ducting not flexible corrugated ducts like these and the ducts should be attached to the roof or soffit to vent completely to the outside not left open in the attic near an attic vent
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Exhaust fan terminates to the outside

Exhaust fan terminates to the outside
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Exhaust fans in separate dwelling units should not share a common exhaust

Exhaust fans in separate dwelling units should not share a common exhaust
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Exhaust Ventilation Testing

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Factory construction practices offer a climate-controlled environment for constructing high-performance homes.

Factory construction practices offer a climate-controlled environment for constructing high-performance homes.
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Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed

Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed
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Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed

Fan CFM rating is higher than the requirement increasing the likelihood that it will meet the performance level once installed
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Fan exhaust ducts vent out through the soffit vent.

Fan exhaust ducts vent out through the soffit vent.
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Fan shares exhaust and does not have dack-draft damper installed

Fan shares exhaust and does not have dack-draft damper installed
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Fan shares exhaust and has a back-draft damper installed

Fan shares exhaust and has a back-draft damper installed
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Fans from seperate dwellings exhausted together without back-draft dampers and not sealed

Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
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Fans supply outdoor air tempered by indoor corridor air to the corridors of a multistory multifamily building, pressurizing the corridors and providing make-up air for the elevator shaft, which is depressurized by an exhaust fan.

Fans supply outdoor air tempered by indoor corridor air to the corridors of a multistory multifamily building, pressurizing the corridors and providing make-up air for the elevator shaft, which is depressurized by an exhaust fan.