Material: armor plate or SGCC galvanized or stainless steel Size(mm)(D*H): (a.400*365).(b.420*365).(c.450*365).(d.550*450).(e.610*465).BTU: (a. 7000-13000) (B. 7000-15000) (c. 7000-18000) (d. 13000-24000) (e. 18000-30000)Load(kg): a,b,c)60+60;( d,)75+75;( e,)90+90. Link: scerws.Surface: polyester powder coating