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The back-draft damper on this exhaust fan is closed to prevent cross contamination

The back-draft damper on this exhaust fan is closed to prevent cross contamination
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The back-draft damper on this exhaust fan is open when the exhaust fan is operating

The back-draft damper on this exhaust fan is open when the exhaust fan is operating
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The back-draft damper open when the fan is actively exhausting and closes when the fan is off

The back-draft damper open when the fan is actively exhausting and closes when the fan is off
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The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan

The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan
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The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0

The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0
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The Mechanics of a Ground Source Heat Pump

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The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone

The natural draft and induced draft furnace are both Category I appliances that receive combustion air from the combustion appliance zone
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The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater

The raised hood at the base of the vent stack on this water heater shows that it is an atmospheric vented gas water heater
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Thermostatic radiator valve operation

Thermostatic radiator valve operation
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Thermostatic radiator valve schematic

Thermostatic radiator valve schematic
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a multi pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance
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This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance

This central heat pump water heating system with a hot water circulation loop that returns to the primary storage tank relies on a single pass heat pump to provide both primary DHW heating and hot water circulation temperature maintenance
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This fuel tank sits at grade but is anchored through its concrete base to the ground beneath with helical earth anchors

This fuel tank sits at grade but is anchored through its concrete base to the ground beneath with helical earth anchors
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This fully packaged/skid-mounted central heat pump water heating system was shipped to the building on a truck and craned into location

This fully packaged/skid-mounted central heat pump water heating system was shipped to the building on a truck and craned into location
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This fully specified central heat pump water heating system has four individual outdoor heat pump units plumbed in parallel to indoor storage tanks

This fully specified central heat pump water heating system has four individual outdoor heat pump units plumbed in parallel to indoor storage tanks
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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
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This mechanical room contains both the storage tanks (right) and heat pumps (left) of a central heat pump water heating system

This mechanical room contains both the storage tanks (right) and heat pumps (left) of a central heat pump water heating system
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This packaged central heat pump water heating system has the heat pumps on the exterior of the blue enclosure, and the storage tanks, temperature maintenance equipment, mixing valve, and control modules on the inside

This packaged central heat pump water heating system has the heat pumps on the exterior of the blue enclosure, and the storage tanks, temperature maintenance equipment, mixing valve, and control modules on the inside
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This retrofit central heat pump water heater system utilizes the existing water heater as a swing tank to provide temperature maintenance for the hot water circulation loop

This retrofit central heat pump water heater system utilizes the existing water heater as a swing tank to provide temperature maintenance for the hot water circulation loop
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This underground fuel tank is anchored to a concrete base to resist buoyancy forces

This underground fuel tank is anchored to a concrete base to resist buoyancy forces
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This wood siding has sustained heavy damage from termites.

This wood siding has sustained heavy damage from termites.
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Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units

Types of heat pump water heaters commonly used in central heat pump water heating systems include single pass units, multi pass units, and integrated units
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Wall Bracing IV: Seismic-Related Provisions

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Wall Bracing V: Building Wood Framed Structures for High Wind Resistance