Fire extinguishing device (100;200;300;400;500), the fire extinguishing device (100;200;300;400;500) comprises a flask engagement means (110;210;310;410;510), arranged to engage with a flask for compressed carbon dioxide and to hold the fire extinguishing device (100;200;300;400;500) in an operating orientation in relation to such a flask ; which flask is associated with a longitudinal direction (L) extending in a upwards direction from a bottom of the flask to a top of the flask and a downwards direction from said top to said bottom , a radial direction (R) perpendicular to said longitudinal direction (L), and an angular direction (A); characterised in that the fire extinguishing device (100;200;300;400;500) further comprises a carbon dioxide directing means (130;230;330;430;530), arranged to direct a jet of carbon dioxide flowing out from the flask when said valve is open; and an actuating means (120;220;320;420;520), arranged to apply a pressure on said valve of said flask , which valve is spring-loaded towards a closed state of the flask , when said flask engagement means (110;210;310;410;510) is in said operating orientation so that the valve as a result of said pressure opens and carbon dioxide flows out from the flask , which actuating means (120;220;320;420;520) in turn comprises a rotary acting lever means for transferring a force applied by a user within said actuating means for applying said pressure, said rotary acting lever means being arranged to work by translating a substantially rotary motion of the rotary acting lever means , whereby a point on the rotary acting lever means at which the user applies said force travels a first distance in this rotary motion, into a corresponding travelled linear second distance of a valve actuator of the flask , said second distance being shorter than said first distance, and in that the flask is a flask for compressed carbon dioxide, which when completely filled contains between 0.4-0.5 kg of liquid phase CO 2 at between about 50 and about 250 bars of pressure. a flask engagement means (110;210;310;410;510), arranged to engage with a flask for compressed carbon dioxide and to hold the fire extinguishing device (100;200;300;400;500) in an operating orientation in relation to such a flask ; which flask is associated with a longitudinal direction (L) extending in a upwards direction from a bottom of the flask to a top of the flask and a downwards direction from said top to said bottom , a radial direction (R) perpendicular to said longitudinal direction (L), and an angular direction (A); characterised in that the fire extinguishing device (100;200;300;400;500) further comprises a carbon dioxide directing means (130;230;330;430;530), arranged to direct a jet of carbon dioxide flowing out from the flask when said valve is open; and an actuating means (120;220;320;420;520), arranged to apply a pressure on said valve of said flask , which valve is spring-loaded towards a closed state of the flask , when said flask engagement means (110;210;310;410;510) is in said operating orientation so that the valve as a result of said pressure opens and carbon dioxide flows out from the flask , which actuating means (120;220;320;420;520) in turn comprises a rotary acting lever means for transferring a force applied by a user within said actuating means for applying said pressure, said rotary acting lever means being arranged to work by translating a substantially rotary motion of the rotary acting lever means , whereby a point on the rotary acting lever means at which the user applies said force travels a first distance in this rotary motion, into a corresponding travelled linear second distance of a valve actuator of the flask , said second distance being shorter than said first distance, and in that the flask is a flask for compressed carbon dioxide, which when completely filled contains between 0.4-0.5 kg of liquid phase CO 2 at between about 50 and about 250 bars of pressure. <EOS>