Existing safe and well maintained heating and air- conditioning systems may remain, provided they comply with the minimum heat output requirements of Sections13-196-400 and 13-196-410. If heating or air- conditioning systems are altered, the alterations shall conform with Chapters 11-4, 13-180*, 13-184* and 13-192*.
(Prior code § 78.1-36)
* Editor’s note – Coun. J. 7-9-03, p. 3609, § 1, repealed Ch.13-180, which pertained to heating provisions, Ch. 13-184, which pertained to warm air heating plants, and Ch. 13-192, which pertained to mechanical refrigeration.