Husqvarna TC 65 2020 Owner's Manual page 104

16 SERVICE WORK ON THE ENGINE
102
Danger
Danger of poisoning Exhaust gases are toxic and
inhaling them may result in unconsciousness and
death.
–
Always make sure there is sufficient ventilation
when running the engine.
–
Use effective exhaust extraction when starting or
running the engine in an enclosed space.
–
Start the engine and check that it is oil-tight.