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TokyoTurtle t1_j1yhc3r wrote

Reply to comment by biffNicholson in TIL that a typical fire extinguisher only lasts seconds while continuously being sprayed. A 20 pound extinguisher can only be sprayed for 25 seconds. by rtpkickballer

In practical terms, introducing fresh air means that the OvenU needs to heat it (requiring energy). You'd also need a definite exhaust path for the (quite hot) air. For a standalone cooker, that would heat the kitchen in short order. For these two reasons it makes sense that they'd be a closed systen.

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