istock pipes on the roof as a part of airconditioning system 1071156490
istock pipes on the roof as a part of airconditioning system 1071156306
istock pipes on the roof as a part of airconditioning system 1071156488
istock Air duct pipe and roof for industrial with blue sky background. 1064288458
istock Dirty Ventilation system on the ceiling 1072145900
istock chemical plant 1157764147
istock AC exhaust 1066194716
istock Air conditioning system. 881470538
istock air cooling industrial system 1139475053
istock detail of a modern CNC machine 825509832
istock air cooling industrial system 825509200
istock detail of a modern CNC machine 825510032
istock The steel pipe from cooling Tower Pumping and Piping install at the outside of building. 955425524
istock The steel pipe from cooling Tower Pumping and Piping install at the outside of building. 955425596
istock The steel pipe Piping install at the outside of building. 955425368
istock Ceiling type hanging air conditioner 675820026
istock Vents The cooling system 813243442
istock ventilation pipe system in kitchen interior 858233004
istock ventilation system on the old factory roof 936776568
istock Modern round ventilation fan tube made of stainless steel hanging on ceiling 1016468442
istock Large water chiller for air condition system on the building rooftop 1129543754
istock Compressor air conditioning system installation embedded on wall of building. 1052910568
istock Air conditioner compressor mounted on a wall 1162467134
istock Ventilation exhaust pipe and duct roofing 923148900
istock Condenser and fan of air compressor 871063730
istock Air Chiller Pipeline and HVAC System of Department Store,  Overhead Building Structure of Air Conditioning Chiller Pipe and Outlet Cooling Systems. Insulation Cover for Piping of Industrail Equipment 1171458938
istock Ventilation Air Duct and HVAC System, Exhaust Hood for Air Blower in Manufacturing Food. Air Vent Blowing and Exhausting Machine Equipment on Roofing Floor in Department Store 1171460836
istock The steel pipe Piping install at the outside of building. 955425516
istock Ventilation Air Duct and HVAC Cleaning System, Exhaust Hood for Air Blower in Manufacturing Food. Industrial Equipment 1141544964
istock air compressor machine part. 875222352