[Regarding] a sheretz that is found in the eye of an oven, [or] in the eye of a stove, [or] in the eye of a kupach, from the inner edge and outward, [the oven] is tahor. And if it was in the air, even [if] an olive’s volume of a corpse [was in the eye, the oven] is tahor. And if there is an opening of a tefach [in the eye], everything is tamei.