玉足软肉夹住摩擦_欧洲人体超大胆露私视频_天天躁夜夜躁狠狠躁2024_激情四射床戏

Large scale wind air heat exchanger, capable of fully automatic operation according to ambient temperature. High heat exchange efficiency, with an energy efficiency ratio of up to 70 times. Any electrical components do not come into contact with the mine exhaust, ensuring safe and reliable operation. The enclosed heat exchange component completely isolates the mine exhaust and fresh air, and can directly heat a 30 ℃ air to 5 ℃ -25 ℃. Widely applicable, directly used for free anti freezing at wellheads and as an air source auxiliary heat source. It is a replacement product for exhaust shaft heating.