I have a project where I need to heat a single story enclosed parking garage below an upscale apartment building. I plan on using a roof mounted, utility set fan to meet the 1.5 cfm/ft2 of exhaust per 2000 IMC. This results in approximately 25,000 cfm of exhaust air. Question: Should I heat the make-up air with an air handler(s) or draw untreated air through louvers and mount unit heaters throughout the garage? What arrangement is typical for a heated parking garage?
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