1) Sealing box - концевая муфта?

2) The inlet and outlet sealing boxes are separated in single chambers, which are produced through installed blinds. - Концевые муфты на входе и выходе находятся в отдельных камерах, ....

Контекст:
Low temperature furnace
At the outlet side of the muffle there is an outlet sealing box. Besides the sealing box function this sealing box is also responsible for the re-cooling. The inlet and outlet sealing boxes are separated in single chambers, which are produced through installed blinds.

Заранее большое спасибо!