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Calibrations are specific to each airflow station model and size and are needed to convert measured station pressure to airflow

Calibrations are specific to each airflow station model and size and are needed to convert measured station pressure to airflow
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Casement windows allow full airflow through the entire window area

Casement windows allow full airflow through the entire window area
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Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside

Category III oil-fired, sealed-combustion boiler configured as a direct-vented appliance that draws its combustion air from outside
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Category III oil-fired, sealed-combustion boiler with the burner assembly cover removed

Category III oil-fired, sealed-combustion boiler with the burner assembly cover removed
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Category IV oil-fired condensing boiler with direct vent pipe

Category IV oil-fired condensing boiler with direct vent pipe
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Ceiling fans can be used to aid a night flush strategy by helping to cool down wall and floor surfaces more thoroughly at night, and by providing comfort ventilation during the day

Ceiling fans can be used to aid a night flush strategy by helping to cool down wall and floor surfaces more thoroughly at night, and by providing comfort ventilation during the day
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Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off

Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Case Study:

Colleyville Eco House Prototype

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Combined space and water heating system with tankless gas water heater

Combined space and water heating system with tankless gas water heater
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Comfort ventilation focuses on airflow over occupants; in this example of wind-driven cross ventilation, the air is directed through the main occupied areas of the bedroom

Comfort ventilation focuses on airflow over occupants; in this example of wind-driven cross ventilation, the air is directed through the main occupied areas of the bedroom
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Concept behind an evaporative cooler – warm air is cooled as the air passes through a wet medium and gives up some of its heat to evaporate the water

Concept behind an evaporative cooler – warm air is cooled as the air passes through a wet medium and gives up some of its heat to evaporate the water
Case Study:

Concord Cape Prototype

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Condensate from this heat pump water heater is routed to a nearby floor drain, shared with the condensate lines from a condensing gas furnace and an air conditioning coil

Condensate from this heat pump water heater is routed to a nearby floor drain, shared with the condensate lines from a condensing gas furnace and an air conditioning coil
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Condensing boilers have primary and secondary heat exchangers

Condensing boilers have primary and secondary heat exchangers
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Cool air flow is produced when the cooling cycle is energized (set thermostat to “cool”)

Cool air flow is produced when the cooling cycle is energized (set thermostat to “cool”)
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Cool towers like this one at the Zion National Park Visitor Center can provide cooling to a building without any energy consumption

Cool towers like this one at the Zion National Park Visitor Center can provide cooling to a building without any energy consumption
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Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions

Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions
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Create a cool room to shelter from extreme heat by selecting a room in the basement or on the north or shaded side of the house, air sealing and insulating, providing low-wattage and battery-operated cooling, and reducing interior heat loads.

Create a cool room to shelter from extreme heat by selecting a room in the basement or on the north or shaded side of the house, air sealing and insulating, providing low-wattage and battery-operated cooling, and reducing interior heat loads.
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Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections

Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
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Deep overhangs and porches provide midday shade for most of the windows on this home in Albuquerque, NM.

Deep overhangs and porches provide midday shade for most of the windows on this home in Albuquerque, NM.
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Dense hedges can encourage cross ventilation (left image) or not (right image) depending on how they are placed relative to windows

Dense hedges can encourage cross ventilation (left image) or not (right image) depending on how they are placed relative to windows
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Designing Porous Polymers for Daytime Radiative Cooling

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Desuperheater for domestic hot water

Desuperheater for domestic hot water
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Direct vent appliance installed

Direct vent appliance installed