requirement
*New requirements for piping, tubing and fittings used in hydronic systems

2021 Edition

Significant changes to the 2021 UMC include:
*New Appendix F - Geothermal Energy Systems
*New guards and rails requirements for installation of equipment and appliances on roofs
*New ventilation requirements for transient and nontransient occupancies
*New ventilation requirements for indoor air quality for residential occupancies

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