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Vents with screens should not be used for clothes dryer exhaust ducts because the screen can easily get clogged with dryer lint and stop air flow

Vents with screens should not be used for clothes dryer exhaust ducts because the screen can easily get clogged with dryer lint and stop air flow
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Wall Bracing: Satisfy the code with strong, resilient, fully sheathed walls

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Wallingford Passive House | Exterior Assembly Details

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Waverly Home Addition | Exterior Cladding Details

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Well sealed duct lifted into raised ceiling chase

Well sealed duct lifted into raised ceiling chase
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When condensation forms on the interior side of wall sheathing and is not able to dry out, it can lead to mold growth and rotting of wall sheathing and framing

When condensation forms on the interior side of wall sheathing and is not able to dry out, it can lead to mold growth and rotting of wall sheathing and framing
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When installing exhaust fan ducts, use as few elbows as possible

When installing exhaust fan ducts, use as few elbows as possible
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When installing exhaust fan ducts, use rigid metal ductwork

When installing exhaust fan ducts, use rigid metal ductwork
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When installing exhaust fan ducts, use the shortest duct runs possible to the outside

When installing exhaust fan ducts, use the shortest duct runs possible to the outside
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When installing fasteners in roof sheathing, common mistakes include using the wrong size fasteners, missing the framing members, overdriving nails, and using too many or too few fasteners.

When installing fasteners in roof sheathing, common mistakes include using the wrong size fasteners, missing the framing members, overdriving nails, and using too many or too few fasteners.
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When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor and pressure taps

When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor and pressure taps
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When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor

When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor
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When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples

When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples
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Why A Sealed FORTIFIED Roof

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Wide saddle support provides sturdy support for the turn without pinching the flex duct

Wide saddle support provides sturdy support for the turn without pinching the flex duct
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Wind path and uplift force for a gabled roof, a hip roof, and a pyramidal (another variant of a hip) roof design

Wind path and uplift force for a gabled roof, a hip roof, and a pyramidal (another variant of a hip) roof design
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Wind Resistant Roof Types

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With a quality installation, tape can last a long time

With a quality installation, tape can last a long time
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With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit

With the nailed block method, wood blocks are attached to the sill plate and the cripple wall plywood is attached to the block to provide shear strength for correctly bracing a cripple wall in a seismic retrofit
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With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.

With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.
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Wood Frame and Steel Sheathing Tornado Safe Room

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Wood Tornado Shelters Segment 4

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Wrong - Code requires a kitchen exhaust fan duct to be a smooth metal duct (galvanized steel, stainless steel, or copper) and to terminate outside, not in an attic or crawlspace.

Wrong - Code requires a kitchen exhaust fan duct to be a smooth metal duct (galvanized steel, stainless steel, or copper) and to terminate outside, not in an attic or crawlspace.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.