2. Install the exhaust fan, and then pull the aluminum foil hose to one hole connected with the hole, and the other to the joint covering the outlet of the exhaust fan.

3. Cover the outlet of the exhaust fan with aluminum foil hose. Pay attention to the appropriate diameter, and it is not easy to pick it up if it is small or too big; Then seal the seam with aluminum foil tape.

4. The interface must be wound several times. After installation, the exhaust fan should be turned on to test whether the exhaust is normal, that is, the installation is completed.