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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0844789 (1992-03-02) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 24 인용 특허 : 0 |
In a dwelling having a forced warm air type central heating system in which the source of heat is the hot gas products of combustion in a furnace, ambient fresh air is introduced into the dwelling to improve the quality of air in the dwelling by a fresh air input duct to the fresh air input of a rel
In a dwelling forced warm air type central heating system in which the source of heat is the hot gas products of combustion in a furnace and that hot gas is carried from the furnace by a flue pipe to the ambient atmosphere outside the dwelling while the warm air is carried by ducts between the furna
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