Convection hom ca iav tempering rauv yog lub upgrade version ntawm hom hom ca iav tempering rauv.Dhau li ntawm txhua hom iav uas hom tempering rauv tuaj yeem ua tau, convection tempering rauv tuaj yeem ua rau qis-e iav tempering.Raws li txoj haujlwm convection, nws tuaj yeem ua ntau hom qis-e iav.