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A central fan-integrated supply system uses a fresh air intake ducted to the home's central furnace or air handler unit to supply fresh air throughout the home

A central fan-integrated supply system uses a fresh air intake ducted to the home's central furnace or air handler unit to supply fresh air throughout the home
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A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance.

A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance.
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A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi-pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance

A central heat pump water heating system with a parallel loop tank temperature maintenance configuration uses a multi-pass heat pump water heater to provide all the heat for hot water circulation temperature maintenance
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A central heat pump water heating system with a temperature maintenance swing tank configuration uses the water from the primary storage tank to provide most of the heat for hot water circulation temperature maintenance

A central heat pump water heating system with a temperature maintenance swing tank configuration uses the water from the primary storage tank to provide most of the heat for hot water circulation temperature maintenance
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A Corsi-Rosenthal Box is a highly effective DIY air cleaner made of easy to obtain materials such as HVAC filters, a box fan, cardboard, and tape

A Corsi-Rosenthal Box is a highly effective DIY air cleaner made of easy to obtain materials such as HVAC filters, a box fan, cardboard, and tape
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A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.

A demand plumbing layout uses a recirculation pump to speed delivery of hot water to plumbing fixtures.
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A high-efficiency gas boiler provides hot water to the faucets, to radiant heating loops in the basement floor, and to a hydro-coil for a central air heating system.

A high-efficiency gas boiler provides hot water to the faucets, to radiant heating loops in the basement floor, and to a hydro-coil for a central air heating system.
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A premade gasket seals out air leaks around the water line.

A premade gasket seals out air leaks around the water line.
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A push button operates the on-demand hot water circulation pump in this master bathroom.

A push button operates the on-demand hot water circulation pump in this master bathroom.
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A reversible window fan can operate via thermostatic or remote control and can selectively exhaust air or bring in outdoor air

A reversible window fan can operate via thermostatic or remote control and can selectively exhaust air or bring in outdoor air
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A variety of battery-powered fans can be used for a cool room without electric power; most charge off a USB charger so they can be solar charged

A variety of battery-powered fans can be used for a cool room without electric power; most charge off a USB charger so they can be solar charged
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A ventilation controller with a manual override is located on a central air handler fan that is located in an accessible location

A ventilation controller with a manual override is located on a central air handler fan that is located in an accessible location
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A water softener collects water, filters it to remove minerals, and then sends it to the home's plumbing distribution system

A water softener collects water, filters it to remove minerals, and then sends it to the home's plumbing distribution system
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Air Admittance Vents

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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 seal and insulate around the exhaust fan with a rigid foam box

Air seal and insulate around the exhaust fan with a rigid foam box
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Air seal around kitchen and bathroom exhaust fans to keep conditioned air from leaking into unconditioned space.

Air seal around kitchen and bathroom exhaust fans to keep conditioned air from leaking into unconditioned space.
CAD File:

Air seal at chase walls - plan

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Air seal at chase walls - plan
CAD File:

Air seal at top plate pipe penetration

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Air seal at top plate pipe penetration
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Air seal whole-house fans to minimize air leakage.

Air seal whole-house fans to minimize air leakage.
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Air sealing at whole house fan enclosure

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Air sealing at whole house fan enclosure
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Air-seal around all plumbing and piping installed through walls, ceilings, and flooring adjacent to unconditioned space to prevent air leakage.

Air-seal around all plumbing and piping installed through walls, ceilings, and flooring adjacent to unconditioned space to prevent air leakage.
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All components of the recirculation system should be included in the plumbing layout.

All components of the recirculation system should be included in the plumbing layout.
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All of the pipes are insulated on this high-efficiency 50-gallon heat pump water heater.

All of the pipes are insulated on this high-efficiency 50-gallon heat pump water heater.