An oven: Its beginning is four [handbreadths] and its remnants are four [handbreadths, these are] the words of R’ Meir. But the Sages say: When do these words apply? In [the case of] a large [oven], but in [the case of] a small [oven], its beginning is the smallest amount and its remnants are the majority of it. [The above applies] from the time its manufacture is complete. What is [considered] the completion of its manufacture? From when one heats it enough to bake sponge cakes in it. R’ Yehudah says: When one heats a new [oven] enough to bake sponge cakes in an old [oven].

A stove: Its beginning is three [fingerbreadths] and its remnants are three [fingerbreadths], from the time its manufacture is completed. What is [considered] the completion of its manufacture? From when one heats it enough to cook on it the most easily cooked egg, [which has been] beaten and put into a stewpot. A kupach: [If] one made it for baking, its measure is that of an oven; [if] one made it for cooking, its measure is that of a stove. A stone that juts out one handbreadth from an oven, or three fingerbreadths from a stove, [is] a connection. [A stone] that juts out of a kupach: [If] one made it for baking, its measure is that of an oven; [if] one made it for cooking, its measure is that of a stove. R’ Yehudah said: They only said ‘‘one handbreadth’’ between the oven and the wall. [If] two ovens were adjacent to each other, one handbreadth is allotted to one [oven] and one handbreadth to the other [oven], and the remainder is tahor.