An explosion ripped through the gas heating installation used by the wood particle driers in a particleboard unit of a furniture factory. This explosion was followed by 4 others involving the wood particles put into suspension. A worker changing the blades in the chipper and another employee working with compressed air in the particle silo were killed. The walls of the particle silo were damaged in the blast and the grinding and drying zones were seriously damaged (the structure collapsed). Various fires appeared. The fire in the heating facility was brought under control after several hours. The electrical installations were not adapted to the dusty environment.