Also if the building incorporattes living quarters they should be separated as far as is possible from storage and display. The Japanese have always accorded a great deal of respect to their sword. Careful handling and storage have ensured that many pieces have survived intact to the present day. After a thousand years of practice their methods are proven. Maintainance equipment should be kept clean so as to avoid contamination with grit particles.
Plastic bags are about the best way of avoiding such problems.
It might also be a good idea to wear a face mask to avoid water vapour, getting on the blade. It was traditional that a sword be bowed to, on first being picked up. If nothing else taking the time to do this moderates the pace and calms the spirit. Drawing and resheathing the sword is not a casual event. On withdrawal the sword is gripped edge up and horizontally, with the saya in the left hand and the tsuke in the right, thumbs facing each other.