Alkūnė 90° su inspektuojančiom durelėm 

  

Used as a load-bearing part of the chimney. It forms an arch of the angle of 90°. It is additionally equipped with an inspection cover. D dimension as for BGT 90.

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# dn A
  [mm] [mm]
1 180 359
2 200 369
3 225 433
4 250 445
5 300 470