1, waterproof 2, recyclable 3, beautiful and elegance 4, easy installation, low-cost maintenance LESCO WPC Diffusers1, Good capability of aeration and beautiful figure 2, Usually used for circle wind of washrooms and toilets 3, As adornment of elevator, nozzle and manhole 4, Also for vent of outer wall of warehouse 5, Filters can be added on the vent if necessary 6, Four models: fixed, door ...