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Buildings and Their Systems
"Build it tight and ventilate it right," the building science saying goes. Which means, today, we want to build homes as tight as possible, and then add controlled mechanical ventilation. We want to ventilate a home to give occupants enough fresh (outside) air to stay healthy, remove odors, dilute indoor pollutants and lower indoor relative humidity. Remember the old way to think about home ventilation was that a leaky home breathes, which is true, but counting air leakage as ventilation is bad because that air could be really polluted coming from the crawlspace or attics or completely unconditioned. There are 4 ways to add mechanical ventilation explained in Section 1.18.
Mechanical ventilation can be in several different forms:
This ASHRAE Standard 62.2 references ventilation requirements and calculations for homes and is a BPI standard you will need to know for the BPI exam.
To learn about issues involved with attic ventilation, check out Section 2.12.
Next Section To 2B
2a. Building Components
2b. Conservation Strategies
2c. Comprehensive Building Assessment Process
2d. Design considerations