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Air flow is produced when central HVAC fan is energized (set thermostat to “fan”)

Air flow is produced when central HVAC fan is energized (set thermostat to “fan”)
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Air inlet is located in a convenient place for homeowner to clean

Air inlet is located in a convenient place for homeowner to clean
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Air inlet is not convenient for cleaning and located next to exhaust outlets

Air inlet is not convenient for cleaning and located next to exhaust outlets
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Air seal and insulate flex ducts

Air seal and insulate flex ducts
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Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam

Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
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All of the exhaust fans are wired to one labeled switch at the electrical panel

All of the exhaust fans are wired to one labeled switch at the electrical panel
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All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6

All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
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All return air and mechanically supplied outdoor air pass through filter prior to conditioning

All return air and mechanically supplied outdoor air pass through filter prior to conditioning
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An air vent mounted high on the radiator will shut quickly and limit the radiator’s heat output

An air vent mounted high on the radiator will shut quickly and limit the radiator’s heat output
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An air vent mounted low on the radiator will allow more steam to enter the radiator before it shuts

An air vent mounted low on the radiator will allow more steam to enter the radiator before it shuts
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An anode bar (upper grey bar) is installed in a steel boiler

An anode bar (upper grey bar) is installed in a steel boiler
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An elevated HVAC condenser on a cantilever platform, in a coastal climate

An elevated HVAC condenser on a cantilever platform, in a coastal climate
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An energy recovery ventilator (ERV) transfers both heat and moisture between incoming and outgoing streams of air

An energy recovery ventilator (ERV) transfers both heat and moisture between incoming and outgoing streams of air
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An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air

An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air
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An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air and dehumidification is provided separately

An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a Packaged Terminal Heat Pump provides conditioned air and dehumidification is provided separately
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An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a radiant heating system provides heating

An Energy Recovery Ventilator provides outside air to this dwelling unit; a range hood with dedicated makeup air provides local kitchen exhaust; a radiant heating system provides heating
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An HRV or ERV provides balanced ventilation

An HRV or ERV provides balanced ventilation
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An independent ducted dehumidifier draws air from and supplies air to the living space using its own ducts, not ducts that are connected to the HVAC system

An independent ducted dehumidifier draws air from and supplies air to the living space using its own ducts, not ducts that are connected to the HVAC system
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An innovative U-shaped heat pump offers SEER 15 efficiency and operation with smart phones

An innovative U-shaped heat pump offers SEER 15 efficiency and operation with smart phones
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An oil-fired boiler with direct combustion air and exhaust venting

An oil-fired boiler with direct combustion air and exhaust venting
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Anode bars can protect boiler steel without the bad effects of chemical water treatment

Anode bars can protect boiler steel without the bad effects of chemical water treatment
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Assembled section of fiber board duct

Assembled section of fiber board duct
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At the outlet of the dryer exhaust duct, install a hooded vent with a louvered damper

At the outlet of the dryer exhaust duct, install a hooded vent with a louvered damper
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Average wet-bulb temperatures across the United States

Average wet-bulb temperatures across the United States