What is the minimum height allowed for a 90-degree horizontal discharge above grade when passing the roof edge?

Prepare for the NRPP Radon Mitigation Specialist Exam. Use flashcards and multiple choice questions with hints and explanations. Get ready for your certification!

The correct choice for the minimum height allowed for a 90-degree horizontal discharge above grade when passing the roof edge is 20 feet. This requirement is often established to ensure proper dispersal of exhaust gases or air, preventing them from re-entering the building or affecting nearby structures or outdoor spaces.

Maintaining a height of 20 feet above grade helps to mitigate any potential hazards that could arise from discharges, such as the buildup of harmful gases in low-lying areas, and it reduces the chances of those emissions affecting individuals or negatively impacting the environment. This height also accounts for potential variations in ground elevation and ensures that the discharge is safely elevated relative to other structures or features that may be present on a property.

In addition, compliance with local building codes or regulations often stipulates these heights to harmonize with safety standards in construction and design for buildings with HVAC systems or similar ventilation needs.

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