The entire board size: 1.22 m * 3.66 m = 4.4652 m2 grill according to different uses different raw materials used, the price will be very different. FRP grating thickness: 25mm thickness: Suitable for general drainage ditch, the inner diameter of the groove width not exceeding 30cm, can load about 3 tons of pressure off the car. 30mm thickness: suitable for drains and wash stations, following distance between the support of no more than 40cm better, bearing about 3.5 tons of pressure off the car. 38mm thick: for gutters and car wash station, the following support spacing (horizontal and vertical) to no more than 50cm better, can carry about four tons of car. 50mm thick: for sewage treatment plants to meet the design requirements of any construction drawings.