indoor dryer vent set has 3 layers of filtering functions: water drawer filter, stainless steel filter screen filter, and polyester filter. These three-layer filtering functions effectively capture fine , dust, and pet hair in the air, ensuring a good indoor environment and caring for ! You don' need to purchase an additional flexible aluminum duct, it can be extended up to 9.8FT to easily meet various angles and lengths. The ventilation opening of the indoor dryer releases hot steam into the room for heating, reducing the energy consumption of other equipment and saving energy costs in the cold winter. If the indoor humidity is too high, it is recommended to open the to reduce the indoor humidity. The ventilation opening of the indoor dryer is easy to clean and use. Just scrape off the lint on the back of the filter, take out the drawer to clean and replace with fresh water. Stainless steel filters do not need to be replaced. We do not recommend cleaning polyester filters with water; Simply remove the polyester filter and vacuum it with a vacuum cleaner. Colour:As Shown Material:plastic Package Contents: 1 x Dryer vent 6 x Polyester filter pads 1 x Vent hose Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.