Mechanical engineer prepares per architect’s plans… Mandatory 1. Windows, doors, fenestration must be rated for leakage 2. All window, door, fenestration U-factor and Solar Heat Gain information must come from either default tables, appendix table (< 100,000 sf), or NFRC rating procedure 3. Building products must be labeled 4. Minimum R-13 on residential walls Prescriptive [...]

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