All educational and vocational instruction, demonstration, fabrication, simulation, or construction shall occur within the confines of the principal building. No educational and vocational instruction, demonstration, fabrication, simulation, or construction shall occur within any accessory building or structure. No offensive vibrations, smoke, dust, waste, odors, heat, light, glare, or noise shall be produced from any educational and vocational, demonstration, fabrication, simulation, or construction occurring within the confines of the principal building or any accessory structure. All electrical and mechanical equipment operated or used in connection with the educational and vocational instruction, demonstration, fabrication, simulation, or construction shall be adequately screened to reduce visual impacts and noise.