TheVFHB-M- SERIES, vertical four pass solids fuel fired hot water boilers is designed for maximum efficiency, using a variety of solid fuels including agro-waste fuels. It allows required process temperatures at required operating pressures. The combustion system for solid fuels consists of fuel handling and stoking equipment, refractory lined chamber, air and flue gas handling system (including I.D. fan and F.D. fan) with blowers and pollution control equipment. The furnace construction is done on site (only for bricks works). It includes foundation, fabrication and erection of supporting structure, building up refractory chambers, fixing up firing doors, ash doors, access doors, support bars for fire grates, grate bars, etc.