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This new filter is inserted into furnace filter slot on the return side of the furnace with the arrow on the side of the filter frame pointing in the direction of airflow, which is toward the furnace.

This new filter is inserted into furnace filter slot on the return side of the furnace with the arrow on the side of the filter frame pointing in the direction of airflow, which is toward the furnace.
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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 sump pump is installed correctly

This sump pump is installed correctly
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Three inches of closed-cell spray foam (R-19) and 7.5 inches (R-28) of open-cell spray foam was installed below the roof sheathing in this cathedral ceiling.

Three inches of closed-cell spray foam (R-19) and 7.5 inches (R-28) of open-cell spray foam was installed below the roof sheathing in this cathedral ceiling.
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To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side

To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side
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To move a water heater off a platform, wrap one end of a ratchet strap around the top of a hand truck and the other end to the water heater drain valve, tighten the strap, tip the water heater, and when the tank clear the platform, tighten the strap.

To move a water heater off a platform, wrap one end of a ratchet strap around the top of a hand truck and the other end to the water heater drain valve, tighten the strap, tip the water heater, and when the tank clear the platform, tighten the strap.
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To move a water heater, you can use two pieces of PVC or ABS pipe to roll it or a hoisting net lift to lift and carry it.

To move a water heater, you can use two pieces of PVC or ABS pipe to roll it or a hoisting net lift to lift and carry it.
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Transfer grill sealed with mastic

Transfer grill sealed with mastic
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Transfer grille not sealed

Transfer grille not sealed
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Turn on power to the water heater from the circuit breaker.

Turn on power to the water heater from the circuit breaker.
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Twisting and compressing flex duct will block air flow

Twisting and compressing flex duct will block air flow
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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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Typical basement foundation and safe room.

Typical basement foundation and safe room.
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Typical roof truss top chord bracing

Typical roof truss top chord bracing
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Typically, you will remove the glass panels from the frame before installation; check the manufacturer’s instructions.

Typically, you will remove the glass panels from the frame before installation; check the manufacturer’s instructions.
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UAF Cooperative Extension Service: Radon Mitigation in Super-Insulated Slab

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UMN NorthernSTAR: DOE Building America: Exterior Foundation Insulation

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Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities

Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities
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Untreated lumber has been used on a below-grade wall against masonry

Untreated lumber has been used on a below-grade wall against masonry
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Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam

Unvented air-sealed crawlspace is insulated along the perimeter walls with rigid foam
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Unvented Attic Insulation (1)

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Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas

Unvented concrete masonry unit crawl space with exterior insulation - designed for termite resistance in moderately infested areas
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Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and a fully adhered membrane seal at the top of wall-to-roof transition

Unvented roof assembly at eave retrofitted with rigid foam, spray foam, and a fully adhered membrane seal at the top of wall-to-roof transition