[If the courtyard] was separate from the stove: When it is three fingerbreadths high, it contracts tumah via contact and via airspace, [but if it is] less than this, or it was flat, it is tahor. The feet of a stove: Three of three fingerbreadths contract tumah via contact and via airspace, [but if they are] less than this [then] they are certainly tamei, and even when they are four.