| 摘要 |
PCT No. PCT/FI89/00102 Sec. 371 Date Feb. 9, 1990 Sec. 102(e) Date Feb. 9, 1990 PCT Filed Jun. 3, 1989 PCT Pub. No. WO89/11928 PCT Pub. Date Dec. 14, 1989.A focussed ventilation system where impure gas, or excess heat is drawn off from a source of impurities at the work space (18). The impure gas, or excess heat is moved to a collection zone located in the room space, wherefrom said impure gas, or excess heat is drawn to be treated further or conducted away from the room space.
|
