The fourth condition: The ceiling of the place where one prays should not be so low, that one may not be able to stand erect, nor should the place be so small, that there may be no room for performing Ruku’ or Sajdah.

894. If a person is forced to offer prayers at a place where it is not at all possible to stand, he will pray while sitting. And if it is not possible to perform Ruku’ and Sajdah, he should perform them by head signs.

Fourth Condition

832. The dress of one who is praying should not be made of any part of the body of an animal whose meat is Haraam. If there is even hair, his prayers will be void.

833. If the saliva, or water from the nose, or any other moisture, from an animal whose meat is Haraam to eat, like that of a cat, is on the body or the dress of a person who is praying, and if it is wet, the Namaz will be void. But if it has dried up, and if its substance has been removed, then the prayer is valid.