Convents have laundries and schools. Surely these are public institutions.

The Catholic Answers

If the Sisters conduct an institution, that institution is distinct and separate from the convent proper, and may be inspected at any time by any authorized person. But the right to inspect a public institution does not give the right to inspect the manager’s private home. Would you insist that he must show you the kitchen, dining-room, bath-room, in his personal quarters, and let you see for yourself that there were no dead bodies under the linoleum?

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty