| 摘要 |
A door (2) is mounted in a frame (1) fixed to a wall (21). The door has vertical side members (24,25), horizontal top and bottom members (3) and front and rear surface panels (4,35). A heating unit (6) is located within the door. The heating unit (6) consists of a substrate (8) of insulating material which carries an electrically conducting film (9). The conducting film (9) is arranged as a series of horizontal bands (26) which are connected to a power source (15,17) by vertical copper collectors (27,28) and flexible cable (18). |
