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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 constant airflow regulator is a modulating orifice that automatically regulates airflows in duct systems to constant levels

A constant airflow regulator is a modulating orifice that automatically regulates airflows in duct systems to constant levels
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A constant airflow regulator is fitted into the neck of the supply duct to control air flow to deliver the design airflow regardless of pressure variations

A constant airflow regulator is fitted into the neck of the supply duct to control air flow to deliver the design airflow regardless of pressure variations
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A detergent port on a steel boiler

A detergent port on a steel boiler
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A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.

A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
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A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts

A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts
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A flanged window unit is installed with straps that fasten to the interior surfaces of the plywood extension box; furring strips on each side of the window will be attached after the flanged window is installed and flashed

A flanged window unit is installed with straps that fasten to the interior surfaces of the plywood extension box; furring strips on each side of the window will be attached after the flanged window is installed and flashed
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A flow grid is inserted into the filter grille/slot to directly measure airflow.

A flow grid is inserted into the filter grille/slot to directly measure airflow.
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A fuel tank should be anchored with ground anchors designed for site conditions to maintain secure connection to its base in a flood or earthquake

A fuel tank should be anchored with ground anchors designed for site conditions to maintain secure connection to its base in a flood or earthquake
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A main vent is installed on the side of a drip leg

A main vent is installed on the side of a drip leg
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A nitrogen pressure test was completed on this ductless mini-split heat pump using a digital manifold gauge.

A nitrogen pressure test was completed on this ductless mini-split heat pump using a digital manifold gauge.
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A PV panel anchoring system

A PV panel anchoring system
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A riser vent is installed on the stub-out below the hand valve

A riser vent is installed on the stub-out below the hand valve
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A roof mounting system for a PV system

A roof mounting system for a PV system
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A simple vented attic with good air-sealing of the drywall ceiling air barrier, air flow from soffit vents to ridge vents protected by ventilation baffles, and lots of insulation covering the attic floor is unlikely to encourage ice dams.

A simple vented attic with good air-sealing of the drywall ceiling air barrier, air flow from soffit vents to ridge vents protected by ventilation baffles, and lots of insulation covering the attic floor is unlikely to encourage ice dams.
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A static pressure measurement is taken on this air handler using probes on the supply and return sides of the fan.

A static pressure measurement is taken on this air handler using probes on the supply and return sides of the fan.
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A tree of main vents is installed on top of drip piping

A tree of main vents is installed on top of drip piping
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A vacuum decay test is performed on this ductless mini-split heat pump using a digital micron gauge for accurate measurement; a deep vacuum is achieved quickly by using large diameter, vacuum-rated hoses, and removing valve cores

A vacuum decay test is performed on this ductless mini-split heat pump using a digital micron gauge for accurate measurement; a deep vacuum is achieved quickly by using large diameter, vacuum-rated hoses, and removing valve cores
Video:

Adding weatherstripping to a door

Presentation:

Advances in Manufactured Home Energy Efficient Design

Advances in Manufactured Home Energy Efficient Design
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After attaching netting to the 2x6 studs, workers fill the wall cavities with R-23 of blown fiberglass made from recycled bottles.

After attaching netting to the 2x6 studs, workers fill the wall cavities with R-23 of blown fiberglass made from recycled bottles.
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After inserting the new filter, replace the filter slot cover to minimize air leakage and heat loss.

After inserting the new filter, replace the filter slot cover to minimize air leakage and heat loss.