Ключевые слова: air, airconditioning, alloy, aperture, auxiliary, background, bell, block, clarification, conditioner, construction, cross, design, extract, form, freshen, function, geometry, help, hole, infrastructure, lattice, material, metal, module, overlay, panel, pipe, plastic, preserve, protect, protection, rod, service, space, square, system, technical, technical equipment, technics, technology, ventilation,