| 摘要 |
<p>This invention relates to a heater-blower assembly for supplying warm air to subsurface installations that is characterized by a self-contained master blower subassembly which can be used by itself as a source of cool air and a slave heater subassembly which will only operate when connected to the blower. The subassemblies in assembled relation cooperate to shield and keep the power connection therebetween connected. The heater subassembly has a master burner and a slave burner, the master being independently operative while the slave can only operate when the master is actuated.</p> |
