MAP20071501286 Horton, Philip Damping down / Philip Horton Ductwork is an integral part of heating and air-conditioning systems in modern buildins. But unless it is properly protected, ductwork can also serve to spread smode and flames around a building in the event of fire En: Fire prevention. - London. - nº 328, January 2000 ; p. 33 1. Tuberías . 2. Propagación de humos . 3. Propagación de las llamas . 4. Sistemas de ventilación . 5. Calefacción . 6. Aire acondicionado . I. Title. II. Título: Fire prevention.