Mishnah for Kelim 10:7
תַּנּוּר יָשָׁן בְּתוֹךְ הֶחָדָשׁ וּסְרֵידָה עַל פִּי הַיָּשָׁן, נִטַּל הַיָּשָׁן וּסְרֵידָה נוֹפֶלֶת, הַכֹּל טָמֵא. וְאִם לָאו, הַכֹּל טָהוֹר. חָדָשׁ בְּתוֹךְ הַיָּשָׁן וּסְרֵידָה עַל פִּי הַיָּשָׁן, אִם אֵין בֵּין חָדָשׁ לַסְּרֵידָה פוֹתֵחַ טֶפַח, כֹּל שֶׁבֶּחָדָשׁ טָהוֹר:
If an old oven was within a new one, and netting was over the mouth of the old [some versions: new] one: If removing the old one would cause the netting to drop, all of it it is impure; but if not, it is all pure. If a new oven was within an old one and netting was over the mouth of the old one: If there was not a <em>tefach</em> of space between the new oven and the netting, all the contents of the new one are pure.
Mishnah Oholot
A board placed over the mouth of a new oven, overlapping it on all sides to the extent of a handbreadth, If there is uncleanness beneath [the board], vessels above it remain clean; If there is uncleanness above it, vessels beneath it remain clean. In the case of an old oven, they become unclean. Rabbi Yohanan ben Nuri declares them clean. [If the board] is placed over the mouth of two ovens, if there is uncleanness between them, they become unclean. Rabbi Yohanan ben Nuri declares them clean.
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