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Standard roof duct penetration

Roof Area Divider 9. Roof Penetrations Description: Roof penetrations can be categorized by whether the roof is sloped or flat. The preferred method of flashing penetrations through flat roofs involves the construction of a curb around the opening.
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Office of Construction & Facilities Management

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Penetrations Through Standing Seam Metal Roofs

It is not a safety standard. Its application for a specific project is contingent on a designer or other authority defining a specific use. SMACNA has no power or authority to police or enforce compliance with the contents of this document or publication and it has no role in any representations by other parties that specific components are, in fact, in compliance with it. In the event that the petitioner has a substantive disagreement with the interpretation, an appeal may be filed with the Technical Resources Committee which has technical oversight responsibility. The request must pertain to a specifically identified portion of the document that does not involve published text which provides the requested information.
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HVAC DUCT CONSTRUCTION STANDARDS METAL AND FLEXIBLE

Chock-full of good information you won't find anywhere else. Why Roof Penetrations Are Actually a Good Thing April 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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