Air conditioning and plumbing works 🌹 Window opening works 🌹 Ventilation openings and flex installation 🌹 Ventilation openings and flex installation 🌹 Maintenance openings in the riser 🌹 Electrical cable installation above the ground 🌹 Gypsum openings 🌹 Cutting ceilings and concrete columns 🌹 Compressor for breaking sand 🌹