Heat Treatment Base Tray | Custom Furnace Base Tray Manufacturer – FH® Heavy-Duty Base Tray for Industrial Heat Treatment Furnaces FH® (Wuxi Junteng Fanghu Alloy Technology Co., Ltd.) manufactures custom heat treatment base trays for industrial furnace loading systems. Designed as the supporting foundation of heat treatment fixtures, this open-grid base tray provides stable support for heat treatment racks, baskets, vertical posts, workpieces and multi-layer fixture