אורח חיים ע״טOrach Chayim 79

Se’if 1א׳

הָיְתָה צוֹאַת אָדָם מֵאַחֲרָיו, צָרִיךְ לְהַרְחִיק ד' אַמּוֹת מִמָּקוֹם שֶׁכָּלָה הָרֵיחַ, אֲפִלּוּ אִם יֵשׁ לוֹ חֹלִי שֶׁאֵינוֹ מֵרִיחַ, צָרִיךְ לְהַרְחִיק ד' אַמּוֹת מִמָּקוֹם שֶׁיִּכְלֶה הָרֵיחַ לְמִי שֶׁמֵּרִיחַ. וּמִלְּפָנָיו צָרִיךְ לְהַרְחִיק מְלֹא עֵינָיו, אֲפִלּוּ בַּלַּיְלָה אוֹ שֶׁהוּא סוּמָא (תְּשׁוּבַת הָרַשְׁבָּ"א סי' קס"ח בֵּית יוֹסֵף בְּשֵׁם הר"י) שֶׁאֵינוֹ רוֹאֶה אוֹתָהּ צָרִיךְ לְהַרְחִיק עַד מָקוֹם שֶׁאֵינוֹ יָכוֹל לִרְאוֹתָהּ בַּיּוֹם, וְאִם הוּא מִצִּדּוֹ, דִּינוֹ כְּמִלְאַחֲרָיו: הַגָּה: שְׁלִיחַ צִבּוּר הַמִּתְפַּלֵּל, וְצוֹאָה בְּבֵית הַכְּנֶסֶת אוֹ בַּבַּיִת שֶׁמִּתְפַּלֵּל שָׁם, אֲפִלּוּ הוּא לְאַחֲרָיו, בְּכָל הַבַּיִת צָרִיךְ לִשְׁתֹּק עַד שֶׁיּוֹצִיאֶנָּה, מֵאַחַר שֶׁמּוֹצִיא רַבִּים יְדֵי חוֹבָתָן, וְאִי אֶפְשָׁר שֶׁלֹּא יְהֵא אֶחָד מִן הַקָּהָל בְּתוֹךְ ד' אַמּוֹת שֶׁל הַצּוֹאָה. (הַגָּהוֹת מָרְדְּכַי הַחֲדָשִׁים פ' (תְּפִלַּת הַשַּׁחַר) [מִי שֶׁמֵּתוֹ]) וְעַיֵּן לְקַמָּן סוֹף סִימָן צ' וְעַיֵּן לְקַמָּן סי' פ"ז בְּדִין צוֹאָה בְּבַיִת.

One Who Happened Across Excrement at Time of the Recitation [of the Sh'ma], Containing 9 S'ifim If there was human excrement behind him, he must distance himself 4 amot from the place where the smell ceases. Even if he has a sickness where he cannot smell, he must distance himself 4 amot from the place where the smell ceases for a person who is able to smell. And [if it is] in front of him, he must distance himself so it is out of site, even at night or if one is blind (Responsum of the Rashba, Siman 168, Beit Yosef in the name of the Ri) - where he cannot see it - he needs to distance himself until a place where he could not see it [if it was] in the daytime. And if it is to his side, the rule is like [when] it is behind him.Rem"a: A prayer-leader that is praying and there is excrement in the synagogue or house in which he is praying: even if it is behind him anywhere in the house, he needs to [stop the prayers and] be quiet until it is removed [from the house], since he is fulfilling the obligation of others and it is impossible that one of the congregants is not within 4 amot of the excrement. (New Hagahot of Mordechi, chapter "Tefilat haShachar") And see below at the end of Siman 90 (And see below Siman 87 in the laws of excrement in the house)

Se’if 2ב׳

הָיְתָה בְּמָקוֹם גָּבוֹהַּ עֲשָׂרָה טְפָחִים אוֹ נָמוּךְ עֲשָׂרָה, אוֹ שֶׁהָיְתָה בְּבַיִת אֶחָד וְהוּא בְּבַיִת אַחֵר, אֲפִלּוּ הַפֶּתַח פָּתוּחַ וְיוֹשֵׁב בְּצִדָּהּ וְרוֹאֶה אוֹתָהּ, אִם אֵין לָהּ רֵיחַ, יָכוֹל לִקְרוֹת, דְּכֵיוָן שֶׁהִיא בִּרְשׁוּת אַחֶרֶת קָרִינָן בֵּיהּ שַׁפִּיר וְהָיָה מַחֲנֶךָ קָדוֹשׁ לְהָרֹא"שׁ. אֲבָל לְהָרַשְׁבָּ" א דַּוְקָא כְּשֶׁאֵינוֹ רוֹאֶה אוֹתָהּ, וְאִם יֵשׁ לָהּ רֵיחַ לָא מְהַנְיָא הַפְסָקָה וְלֹא שִׁנּוּי רְשׁוּת, וְיֵשׁ אוֹמְרִים דְּכִי הֵיכִי דְּהַפְסָקָה מוֹעֶלֶת לְצוֹאָה עַצְמָהּ, הָכִי נַמֵּי מוֹעִילָה לְרֵיחַ רַע שֶׁלָּהּ.

If it (ie. the excrement) was in a place higher than 10 t'fachim [above him] or 10 below [him] or it was in one house and he is in another house [that's connected], even if the [connecting] door is open and he is sitting at the side [of the door] and sees it: if it does not have a smell, he may recite [the Sh'ma]. Because since it is in a different domain, we can still call it as [having fulfilled the mitzvah of] "...and your camp shall be holy" (Deuteronomy 23:15) according to the Rosh. But according to the Rashba, it's only when he doesn't see it. And if it has a smell, a separation is ineffective and [also] a change in domain is not [effective]. And there are those who say that just as a separation is effective in regards to excrement itself, so too it is effective for its bad smell.

Se’if 3ג׳

חָצֵר קְטַנָּה שֶׁנִּפְרְצָה בִּמְלוֹאָהּ לִגְדוֹלָה, וְהַגְּדוֹלָה עוֹדֶפֶת עָלֶיהָ מִן הַצְּדָדִים, קְטַנָּה לָא חֲשִׁיבָה כְּבַיִת בִּפְנֵי עַצְמָהּ, כֵּיוָן שֶׁנִּפְרְצָה בִּמְלוֹאָהּ לִגְדוֹלָה. אֲבָל הַגְּדוֹלָה, כֵּיוָן שֶׁכְּתָלֶיהָ עוֹדְפִים עַל שֶׁל קְטַנָּה מִצַּד זֶה וּמִצַּד זֶה, חֲשִׁיבָה כְּבַיִת בִּפְנֵי עַצְמָהּ. הִלְכָּךְ אִם צוֹאָה בַּגְּדוֹלָה, אָסוּר לִקְרוֹת בַּקְּטַנָּה, עַד שֶׁיַּרְחִיק כָּשִׁעוּר. וְאִם צוֹאָה בַּקְּטַנָּה, מֻתָּר לִקְרוֹת בַּגְּדוֹלָה בְּלֹא הַרְחָקָה, אִם אֵין מַגִּיעַ לוֹ רֵיחַ רַע.

A small courtyard that is completely breached into a large [one], and the large [one] has some remainder on both sides (ie. it is wider on both sides). The small [one] is not considered like a house in and of itself since it was completely breached into the large [one], but the large [one], since since its walls extend past the small [one] from this side and that side, it is considered like a house in and of itself. Therefore, if there is excrement in the large [one], it is forbidden to recite [the Recitation of the Sh'ma] in the small one, until one distances [oneself] according to the [required] measure. And if the excrement is in the small [one], it is permitted to recite in the large [one], without distancing if a bad smell doesn't reach him.