Figure 2. Australian NFT tables for growing lettuce, herbs and Asian greens at a convenient working height. Channels are 100mm (4 inch) wide and 50mm (2 inch) high. There are two 6m (20 ft) lengths sloping from each end to a central return pipe. For wide lettuce such as ‘iceberg’, there are about five channels per table up to eight to 10 channels for smaller plants as shown here.