MB 5: and some are naked - Some say that if at the present moment there is noone naked then one may put on Tefillin there and say the B'racha, but some prohibit this because since the place is designated for this it has the ruling of a bathhouse in part. It seems from the Taz in Siman 84, that a Mikvah has the rules of the middle room for all purposes and only the Bracha for the immersion is allowed to be said there, look there for his reason. [A Mikvah is a ritual bath - used by men daily, weekly, or even annually according to custom, and used by women one week after the conclusion of a monthly cycle. Women make a blessing after immersing themselves.] But from the Magen Avraham in this Siman, it seems that if there is no one presently naked in it, one may put on Tefillin and say the B'racha, because they were only stringent in a bath house because of the intense sweat as a result of the hot water - which is not the case in a mikvah. [And if they use hot water in the Mikvah as well, further examination is needed.] But if there is someone there naked, it is forbidden to enter with Tefillin or Holy Scriptures because it is forbidden to stand in front of G-d's Name naked. Look later in Siman 84 in the MB about this.
MB 6: The inner room - In this room everybody agrees, even if there is no one naked, that because of the intense sweat it is like a bathroom. [Bathroom in modern terms - a room with a toilet.]
Jonathan Chody jonathan@quantime.co.uk