| 摘要 |
The fresh air intake is made of galvanized metal with a metal screen that ha s 1/4" open squares. The fresh air intake is mounted on the outside of a house and is connected o n the inside of the house to a 4", 5" or 6" vent pipe, that is connected to your return air duct. When your furnace fan is running it draws fresh air in through this fresh ai r intake to supply the home with oxygen. There is a metal cap that protrudes at approxametly a 30 degree angle to cov er the metal screen. |
