Ключевые слова: air, allergic, allergy, building, cancer, circulation, clean, cleaner, cleaning, cleanup, closeup, conditioner, conditioning, construction, cooling, cover, danger, dangerous, design, detail, dirty, duct, dust, dusty, equipment, exhaust, fan, flow, frame, grid, grille, home, housework, industrial, industry, lattice, mesh, old, panel, rough, rust, surface, texture, vent, ventilation, ventilator, wall, white,