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Image:

Wrong – Flex duct is pinched

Wrong – Flex duct is pinched
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Wrong – Insulation has misalignment, compression, and gaps

Wrong – Insulation has misalignment, compression, and gaps
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Wrong – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.

Wrong – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.
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Wrong – Overly powerful kitchen exhaust fans can backdraft other combustion appliances in the home

Wrong – Overly powerful kitchen exhaust fans can backdraft other combustion appliances in the home
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Wrong – Refrigerator was not properly secured to the wall studs of the home.

Wrong – Refrigerator was not properly secured to the wall studs of the home.
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Wrong – Seams in the furnace-to-AC connection at the air handler are not sealed.

Wrong – Seams in the furnace-to-AC connection at the air handler are not sealed.
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Wrong – Spray foam installed with voids

Wrong – Spray foam installed with voids
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Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper

Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper
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Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.
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Wrong –Excessive length and a vertical angle on this dryer duct reduced air flow allowing the dryer duct to become completely clogged with dryer lint

Wrong –Excessive length and a vertical angle on this dryer duct reduced air flow allowing the dryer duct to become completely clogged with dryer lint
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Wrong: HPWH inlet and outlet are piped to mixing valve inlet and DCW make up, driving erratic HPWH and mixing valve behavior

Wrong: HPWH inlet and outlet are piped to mixing valve inlet and DCW make up, driving erratic HPWH and mixing valve behavior
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Wrong: The exhaust air from one heat pump water heater is blowing into the intake of the heat pump water heater next to it

Wrong: The exhaust air from one heat pump water heater is blowing into the intake of the heat pump water heater next to it
Video:

Your Northern Home: Small Space Heater Maintenance