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Image:

Duct to boot connection of jump duct is properly sealed with mastic

Duct to boot connection of jump duct is properly sealed with mastic
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Duct to boot connection of jump duct not fastened and sealed

Duct to boot connection of jump duct not fastened and sealed
Presentation:

Effect of Occupant Behavior and Air Conditioner Controls on Humidity in Typical and Low-Load Homes

Effect of Occupant Behavior and Air Conditioner Controls on Humidity in Typical and Low-Load Homes
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Grill and duct size based on calculated requirements for net free area

Grill and duct size based on calculated requirements for net free area
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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, 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
Image:

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
Video:

Moisture Management in Residential Construction Series - Building Enclosure: Managing Air Flow

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Piping detail for a Gorton #2 riser vent for a steam heating system

Piping detail for a Gorton #2 riser vent for a steam heating system
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Provide for pressure balancing between bedrooms and the rest of the house.

Provide for pressure balancing between bedrooms and the rest of the house.
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Return box has been properly sealed with mastic

Return box has been properly sealed with mastic
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Return box has not been sealed

Return box has not been sealed
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Return duct has been properly sealed with mastic

Return duct has been properly sealed with mastic
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Return has not been sealed

Return has not been sealed
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Right - A stand-alone dehumidifier is located in the return air closet of this multifamily dwelling located in a humid climate

Right - A stand-alone dehumidifier is located in the return air closet of this multifamily dwelling located in a humid climate
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Right – A dehumidifier is installed next to the central heat pump’s air handler to pull air from the supply plenum, remove moisture, and re-introduce the air downstream in the supply plenum; this setup removes moisture efficiently.

Right – A dehumidifier is installed next to the central heat pump’s air handler to pull air from the supply plenum, remove moisture, and re-introduce the air downstream in the supply plenum; this setup removes moisture efficiently.
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Right – A dehumidifier keeps the sealed crawlspace dry.

Right – A dehumidifier keeps the sealed crawlspace dry.
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Right – A transfer grille is installed high on a bedroom wall in a new-construction home

Right – A transfer grille is installed high on a bedroom wall in a new-construction home
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Right – The dehumidifier is installed in the home’s basement.

Right – The dehumidifier is installed in the home’s basement.
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Right – Transfer grilles are installed over doorways to bedrooms in a new-construction home

Right – Transfer grilles are installed over doorways to bedrooms in a new-construction home
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Simplified schematic of a one-pipe steam system showing the main and risers with fast vents and the radiators with slow vents

Simplified schematic of a one-pipe steam system showing the main and risers with fast vents and the radiators with slow vents
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Some radiators are behind covers so the cover must be removed to identify the air vent

Some radiators are behind covers so the cover must be removed to identify the air vent
Case Study:

Technology Solutions Case Study: Hydronic Systems: Designing for Setback Operation

Case Study:

Technology Solutions Case Study: Ventilation System Effectiveness and Tested Indoor Air Quality Impacts