TL;DR
A design pressure rating, written as DP followed by a number, is the tested capacity of a window or door assembly to withstand wind loads, with structural, water-infiltration, and air-leakage performance verified at pressures tied to the rating. A DP40 unit, for instance, survived structural testing at 60 psf and resisted water penetration under a defined spray and pressure.
What it means
A design pressure rating, written as DP followed by a number, is the tested capacity of a window or door assembly to withstand wind loads, with structural, water-infiltration, and air-leakage performance verified at pressures tied to the rating. A DP40 unit, for instance, survived structural testing at 60 psf and resisted water penetration under a defined spray and pressure. Local wind speed, exposure, and building height determine the minimum required for each opening; coastal and high-wind jurisdictions enforce it through product approval listings on the permit documents.
Where it sits in the glossary
Design pressure rating is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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