Fluid channelling system (150; 250) for NMR system (100; 200), characterized in that the channelling system (150, 250) includes: - an exhaust circuit (160; 260) of the NMR system (100; 200) comprising a first fluid circulation branch (161; 261) and a second fluid circulation branch (162; 262), the exhaust circuit making it possible to convey a coolant fluid from a magic-angle spinning NMR device of the NMR system to a compressor of the NMR system; - a feed circuit (180; 280) of the NMR system including a third fluid circulation branch (181; 281) and a fourth fluid circulation branch (182; 282), the feed circuit making it possible to convey the coolant fluid from the compressor to the NMR device; - a first heat exchanger (E11, E21), - a second heat exchanger (E12, E22), - a third heat exchanger (E13, E23) the first branch including a pipe (1612; 2612) of the first heat exchanger, the second branch including a pipe (2624; 2827) of the second heat exchanger and a pipe (1626; 2626) of the third heat exchanger, the third branch including a pipe (1812; 2812) of the first heat exchanger and the fourth branch including a pipe (1827; 2827) of the second heat exchanger and a pipe (1823; 2823) of the third heat exchanger, the third branch (181; 281) including a plurality of sub-branches, the third branch (181; 281) including a first sub-branch for circulation of a first flow the function of which is to rotate a sample-holder (121, 221), by acting on blades or fins of a drive turbine of a rotor of the NMR device (120, 220), the rotor including the sample-holder (121, 221), and a second sub-branch for circulation of a third flow the function of which is to create a bearing supporting the rotor in a stator (122, 222) of the NMR device (120, 220) and a third sub-branch for circulation of a fourth flow the function of which is to cool a heat shield (140, 240) protecting the NMR device (120, 220) from thermal radiation, the fourth branch (182; 282) conveying a second flow of which the sole function is to bring a sample of the NMR device to an appropriate temperature. - an exhaust circuit (160; 260) of the NMR system (100; 200) comprising a first fluid circulation branch (161; 261) and a second fluid circulation branch (162; 262), the exhaust circuit making it possible to convey a coolant fluid from a magic-angle spinning NMR device of the NMR system to a compressor of the NMR system; - a feed circuit (180; 280) of the NMR system including a third fluid circulation branch (181; 281) and a fourth fluid circulation branch (182; 282), the feed circuit making it possible to convey the coolant fluid from the compressor to the NMR device; - a first heat exchanger (E11, E21), - a second heat exchanger (E12, E22), - a third heat exchanger (E13, E23) the first branch including a pipe (1612; 2612) of the first heat exchanger, the second branch including a pipe (2624; 2827) of the second heat exchanger and a pipe (1626; 2626) of the third heat exchanger, the third branch including a pipe (1812; 2812) of the first heat exchanger and the fourth branch including a pipe (1827; 2827) of the second heat exchanger and a pipe (1823; 2823) of the third heat exchanger, the third branch (181; 281) including a plurality of sub-branches, the third branch (181; 281) including a first sub-branch for circulation of a first flow the function of which is to rotate a sample-holder (121, 221), by acting on blades or fins of a drive turbine of a rotor of the NMR device (120, 220), the rotor including the sample-holder (121, 221), and a second sub-branch for circulation of a third flow the function of which is to create a bearing supporting the rotor in a stator (122, 222) of the NMR device (120, 220) and a third sub-branch for circulation of a fourth flow the function of which is to cool a heat shield (140, 240) protecting the NMR device (120, 220) from thermal radiation, the fourth branch (182; 282) conveying a second flow of which the sole function is to bring a sample of the NMR device to an appropriate temperature.