Reference for Bava Batra 2:2

לֹא יַעֲמִיד אָדָם תַּנּוּר בְּתוֹךְ הַבַּיִת, אֶלָּא אִם כֵּן יֵשׁ עַל גַּבָּיו גֹּבַהּ אַרְבַּע אַמּוֹת. הָיָה מַעֲמִידוֹ בָעֲלִיָּה, צָרִיך שֶׁיְּהֵא תַחְתָּיו מַעֲזִיבָה שְׁלשָׁה טְפָחִים. וּבַכִּירָה, טֶפַח. וְאִם הִזִּיק, מְשַׁלֵּם מַה שֶּׁהִזִּיק. רַבִּי שִׁמְעוֹן אוֹמֵר, לֹא אָמְרוּ כָל הַשִּׁעוּרִין הָאֵלּוּ, אֶלָּא שֶׁאִם הִזִּיק, פָּטוּר מִלְּשַׁלֵּם:

One may not stand an oven inside a house unless there is a height above it [from the mouth of the oven until the ceiling] of four cubits, [so that the ceiling not catch fire.] If he stood an oven in an upper story, there must be below it a [clay] paving of three handbreadths, [so that the lower ceiling (i.e., the floor) not catch fire; and a height above it of four cubits.] And with a kirah, [upon which a pot is placed, no large fire being made within it as in a stove], one handbreadth. And if he caused damage [after having observed all of the above regulations], he pays the amount of the damage, [in spite of which he is compelled to observe these regulations, lest he cause fire damage to his neighbors and not have what to pay.] R. Shimon says: All of these regulations were stated only so that if he caused damage (after having observed them), he be exempt from paying. [The halachah is not in accordance with R. Shimon.]

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