In the R-2 zone:
A. All heating, ventilating and air conditioning equipment, including ducts, meters, plumbing lines and tanks, shall be architecturally screened from public view.
B. Mechanical and plumbing equipment shall be screened from view as follows:
1. By masonry walls when mounted at grade;
2. By parapet walls on flat roofs;
3. By parapet walls or in roof wells on pitched roofs.
C. Plumbing vent pipes, all heater flues, and all roof penetrations shall be gathered and concealed from view as required in subsections B2 and B3 of this section. (Ord. 1000 § 19.20(P), 1955)