, ▁where ▁the ▁winter ▁climate ▁is ▁cold . ▁It ▁is ▁made ▁of ▁br icks ▁or ▁other ▁forms ▁of ▁fired ▁cl ay ▁and ▁more ▁recently ▁of ▁concrete ▁in ▁some ▁locations . ▁ ▁Its ▁interior ▁cav ity , ▁leading ▁to ▁a ▁( o ften ) ▁con vol uted ▁fl ue ▁system , ▁channels ▁the ▁hot ▁exhaust ▁from ▁a ▁fire wood / co al ▁fire place , ▁usually ▁the ▁cook ing ▁fire ▁from ▁an ▁adjacent ▁room ▁that ▁serves ▁as ▁a ▁kitchen , ▁sometimes ▁from ▁a ▁st ove ▁set ▁below ▁floor ▁level . ▁This ▁allows ▁a ▁longer ▁contact ▁time ▁between ▁the ▁exhaust ▁( which ▁still ▁contains ▁much ▁heat ▁from ▁the ▁comb ust ion ▁source ) ▁and ▁( ind irect ly ) ▁the ▁inside ▁of ▁the ▁room , ▁hence ▁more ▁heat ▁transfer / re cy cling ▁back ▁into ▁the ▁room , ▁effectively ▁making ▁it ▁a ▁du cted ▁he ating ▁system ▁similar ▁to ▁the ▁hyp oca ust ▁system ▁used ▁by ▁ancient ▁Rom ans . ▁A ▁separate ▁st ove ▁may ▁be ▁used ▁for ▁cont rolling ▁the ▁amount ▁of ▁smoke ▁circul ating ▁through ▁the ▁k ang , ▁maintain ing ▁comfort ▁in ▁war mer ▁weather . ▁Typ ically , ▁a ▁k ang ▁occup ies ▁one - third ▁to ▁one ▁half ▁the ▁area ▁the ▁room , ▁and ▁is ▁used ▁for ▁sleep ing ▁at ▁night ▁and ▁for ▁other ▁activities ▁during ▁the ▁day . ▁A ▁k ang ▁which ▁covers ▁the ▁entire ▁floor ▁is ▁called ▁a ▁d ik ang ▁( ). ▁ ▁Like ▁the ▁European ▁co ck l est ove , ▁a ▁massive ▁block ▁of ▁m