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In this dwelling unit ventilation configuration, a forced air system provides outside air at the same rate as the air being exhausted from the bathroom fan; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake

In this dwelling unit ventilation configuration, a forced air system provides outside air at the same rate as the air being exhausted from the bathroom fan; local kitchen exhaust is provided by a range hood with a dedicated makeup air intake
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In this traditional steam header, the steam makes a 90-degree turn to supply the building, while the heavier water droplets are carried back to the boiler

In this traditional steam header, the steam makes a 90-degree turn to supply the building, while the heavier water droplets are carried back to the boiler
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In this ventilation configuration for a multifamily building, outside air enters through a dedicated outdoor air system (DOAS), and inside air exits the space through bathroom and kitchen exhaust fans

In this ventilation configuration for a multifamily building, outside air enters through a dedicated outdoor air system (DOAS), and inside air exits the space through bathroom and kitchen exhaust fans
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In this ventilation configuration, an air handler provides outside air at the same rate as the air being exhausted from a bathroom fan; local kitchen exhaust has a dedicated makeup air intake; dehumidification is provided separately

In this ventilation configuration, an air handler provides outside air at the same rate as the air being exhausted from a bathroom fan; local kitchen exhaust has a dedicated makeup air intake; dehumidification is provided separately
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Inadequate amount of insulation installed with compression, misalignment, and voids

Inadequate amount of insulation installed with compression, misalignment, and voids
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Incorporating vestibules to separate the garage from interior occupied space can reduce the transfer of contaminants.

Incorporating vestibules to separate the garage from interior occupied space can reduce the transfer of contaminants.
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Indirect evaporative cooler diagram

Indirect evaporative cooler diagram
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Indirect/direct evaporative cooler blower diagram

Indirect/direct evaporative cooler blower diagram
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Install a filter with a MERV rating of 6 or higher in each ducted mechanical system

Install a filter with a MERV rating of 6 or higher in each ducted mechanical system
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Install a master vent tree to release air and prevent air binding which blocks steam heat from reaching its destination

Install a master vent tree to release air and prevent air binding which blocks steam heat from reaching its destination
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Install an access panel cover with a gasket and duct tape the edges

Install an access panel cover with a gasket and duct tape the edges
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Install ducts without excessive coils or loops

Install ducts without excessive coils or loops
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Install ducts without kinks or sharp bends

Install ducts without kinks or sharp bends
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Install supply registers in floors or ceilings to avoid routing ducts through exterior walls

Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
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Install the filter media box between the return air plenum and the air handler box

Install the filter media box between the return air plenum and the air handler box
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Installer permanently labeled ventilation switch

Installer permanently labeled ventilation switch
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Intermittent supply and exhaust fans rated at ≤ 3 sones by manufacturer, unless rated flow ≥ 400 CFM

Intermittent supply and exhaust fans rated at ≤ 3 sones by manufacturer, unless rated flow ≥ 400 CFM
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Karuna Passive House Air-To-Water Heat Pump

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Karuna Passive House HRV Supply Register

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Karuna Passive House Ventilation System

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Kitchen exhaust properly installed and sealed with mastic

Kitchen exhaust properly installed and sealed with mastic