Standard roof duct penetration detail

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A critical component to your complete ductwork system are the parts that come after the fan, at the point of exhaust. In fact, many of the most challenging solutions take place after the fan and prior to exhaust. Duct products at the end of the ducting system can adversely or positively affect fan performance, CFM rates, roof penetrations and environmental factors. US Duct offers standard and custom fabrication for exhaust and roof penetration components that provide the optimal solution. Proper exhaust of your ducting system needs to address two primary factors: air-flow and rain water intrusion.
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Standard Details

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Ductwork Exhaust and Roof Penetration Components | US Duct

When reroofing a home or doing a renovation that creates a new penetration in the roof, inspect and replace or add flashing and sealing around all roof penetrations, such as vents, flue stacks, chimneys, sky lights, mounting brackets for solar panels, etc. Vents, flue stacks, chimneys, sky lights, mounting brackets, etc. Whenever a new hole is cut in the roof, for example to install a flue, a skylight, an exhaust fan duct, or a brackets for solar panels, make sure that installation of proper flashing is part of the job. When the roofing on an older home is replaced, take the opportunity to inspect all of the flashing and repair or replace missing, damaged, or poorly installed flashing at all roof penetrations as well as at roof-wall joints and at valleys. Controlling rainwater is the single most important factor in the design and construction of durable roof assemblies.
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Typical Roofing Details

In association with. Penetrations are one of the greatest threats to the integrity and long-term performance of flat roofs. So how do we ensure that they are absolutely necessary, correctly detailed and properly installed? What types of penetration are typically required in flat roofs?
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On the surface, the idea of adding equipment to a roof without penetrations sounds pretty good. Keep reading to see why this may be the wrong approach It is understandable that people hate roof penetrations and try to avoid them at all cost.
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