
Tips for Passing the PE Exam
There are many paths to the PE exam, and it is important that you prepare for this exam with your own obligations and experiences in mind. See Casey’s tips for passing the exam!
“Is the parking garage open or closed?”
This is, and should be, one of the first questions asked by MEP engineers when a project containing a parking garage is kicked off. Enclosed parking garages require significant design efforts from a mechanical and architectural perspective.
The 2015 International Building Code outlines what defines an “open” parking garage in Section 406.5.2:
If these requirements are met, the garage is considered open is assumed to be naturally ventilated. If they are not, the garage is required to be mechanically ventilated.
The requirements for ventilating an enclosed parking garage can vary depending on the jurisdiction. In Austin, they are outlined in the 2015 Uniform Mechanical Code. Table 403.7 indicates that the minimum exhaust rate for an enclosed parking garage is 0.75 cfm per square foot.
This is usually accomplished with an exhaust fan on each floor of the garage. These systems are required to operate continuously unless they are designed to operate automatically upon detection of vehicle operation or the presence of occupants. This is usually accomplished by providing carbon monoxide detectors throughout the parking garage and interlocking the exhaust fan operation with the carbon monoxide detection system on each level of the parking garage. When carbon monoxide levels in the garage reach a specified level, the associated exhaust fan will be enabled.
The UMC also requires that parking garage exhaust be discharged at the building exterior. It must be 10 feet above grade, 10 feet from any openings into the building (including operable windows), and 10 feet from the property line.
A chase must often be provided (especially in the case of underground parking garages) to allow the exhaust to discharge 10 feet above grade. Not only must the chase be sized for the exhaust airflow, but it also must be able to accommodate the louvers at the discharge point, which can often be very large. It is critical, therefore, that coordination happen early in the design process as this can have a significant impact on the overall building design. Enclosed parking garages require a significant design effort but headaches can be avoided with some early coordination.
You need MEP Engineers who know the importance of early and continuous coordination to ensure successful projects. Contact Us today and let’s discuss your next project!
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There are many paths to the PE exam, and it is important that you prepare for this exam with your own obligations and experiences in mind. See Casey’s tips for passing the exam!
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