Iyiphi Ileveli Yobufakazi Bokuqhuma Iphakeme, I-BT4 noma i-BT6

Ngokwezindinganiso zikazwelonke zokuvikela ukuqhuma kukagesi, kokubili i-BT4 ne-BT6 ziwela ngaphansi kweClass IIB.

Iqembu lokushisa lemishini kagesi	Izinga lokushisa eliphezulu elivumelekile lempahla kagesi (℃)	Izinga lokushisa legesi/umhwamuko (℃)	Amazinga okushisa edivayisi asebenzayo
T1	450	＞450	T1~T6
T2	300	＞300	T2~T6
T3	200	＞200	T3~T6
T4	135	＞135	T4~T6
T5	100	＞100	T5~T6
T6	85	＞85	T6

Nokho, othi 'T’ ukuhlukaniswa kuphathelene nesilinganiso sokushisa samadivayisi kagesi angaqhumi. Amadivayisi ahlukaniswe njenge-T6 kufanele agcine izinga lokushisa elingaphezulu kuka-85°C, I-T5 akumele idlule ku-100°C, futhi i-T4 akumele idlule ku-135°C.

Ukunciphisa indawo ephezulu yedivayisi izinga lokushisa, mancane amathuba okuthi okhele amagesi asemkhathini, ngaleyo ndlela kuthuthukisa ukuphepha. Ngenxa yalokho, isilinganiso sokuvikela ukuqhuma kwe-BT6 sidlula leso se-BT4.