Hamada Boiler continues to develop small and medium size of Fluidized Bed Boiler to meet requirement of many industries in the region. DF series use the most popular model "D" boiler body as a main pressure vessel so that the common spare parts with widely distributed D model will make maintenance easy. Moreover, all D-model already operating in many countries whether fixed grate type or chain travelling grate type can be converted to DF model by constructing fluidized bed combustion chamber just below the main D model boiler body and connect the two components by up going tube and down commer tube. In fact, to date, many chain grate D model boilers have been converted to fluidized bed system in Indonesia.
Ginagamit ng DF series ang sikat na model "D" "boiler body" bilang isang "pressure vesel." Ginagamit nito ang sari-saring mga bahagi para sa "D" model upang maging madali ang pagsasaayos at pagkukumpuni nito. Kaunting pag-aayos at modipikasyon lamang ang kinakailangan upang gawing DF-type ang isang D-model boiler body, maging "fixed grate type" man ito o "travelling gate type." Ginagawa ito sa pamamagitan ng paggawa ng fluidized bed combustion chamber sa ilalim ng model body. Ikinakabit ang dalawang bahaging ito sa pamamagitan ng "up going tube" at "down commer tube." Marami nang ganitong modelo na ginagamit sa iba't ibang bansa, tulad ng Indonesia.