The maximum structure height specified for each district shall not apply to: water towers, decorative clock or bell towers, steeples and religious symbols attached to places of worship, electrical transmission lines, elevator shafts, skylights, chimneys, heating/ventilation/air- conditioning equipment, industrial mechanical equipment areas that are not occupied by humans, or other appurtenances usually required to be and customarily placed above the roof level and not intended for human occupancy. However, all features shall still comply with the height regulations within the Airport Approach Zones. Wind turbines and telecommunications towers and antenna, where allowed, shall meet the applicable height limits for such uses, as opposed to the height limit of the district. See § 600-918 for solar collection devices.