Attach some cord to the outside edge of each of the two opposite flaps, and to the outside edge of each of the boards. Tie the cords on the flaps together to prevent the posters from slipping out. Tie the other cords together to close the portfolio. For more details of computer equipment, see Section 6. Materials need to be protected from damage by sun, heat, damp, rainwater, fire, dust, animals and insects.
Humidity can cause materials to become mouldy.
In dry climates, materials may be damaged by dust or termites. Air conditioning or good ventilation, and regular cleaning, will help to keep materials in good condition. Fresh air and cleaning will help to control infestation by silverfish. Materials can be protected against ants by placing the legs of shelves in tins of water or a mixture of kerosene and water. If eating and drinking is allowed in the resource centre, the resource centre must be cleaned thoroughly, so that food crumbs do not attract insects or rodents.