Dyson proves "no loss of suction", "constant suction" and "doesn't lose suction" using the IEC 60312 Cl 2.9 test standards for all Dyson canister & upright vacuums. Dyson proves "no loss of suction", "constant suction" and "doesn't lose suction" using test methods based on the IEC 60312 Cl 2.9 test standards for the Dyson Handheld.