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Figure 1.
Cieszyn, Poland, castle chapel – St. Nicolas rotunda, 11thcentury Central, firm body with thick stone walls and small windows: South-eastern view. The author’s photograph of 2012
Figure 2.
Dębno, Poland, St. Michael the Archangel Church, 2nd halfof the 15th century: Timbered arcades surrounded all church walls, forming a thermal buffer. The author’s photograph of 2015
Figure 3.
Wrocław, Poland, Saint Cross and Saint Bartholomew Church, 14th century: The main entrance to the upper church. The author’s photograph of 2015
Figure 4.
Malbork, Poland, Middle Castle. Heating stove built to heat the Great Refectory, 14th century: A visible furnace opening at the bottom, an accumulation chamber filled with huge stones at the top. The author’s photograph of 2018
Figure 5.
Malbork, Poland, Middle Castle. Great Refectory, 14th century: One of the 36 openings supplying hot air from the accumulation chamber of the stove located below. The author’s photograph of 2018
Figure 6.
Wrocław, Poland, Saint Cross and Saint Bartholomew Church, 14th century: A view of the open keystones (oculi) of transept and chancel vaults. The author’s photograph of 2017
Figure 7.
Czorsztyn, Poland, Upper Castle. A ventilation opening in the form of a slot window in the cellar of the Upper Castle, 14th century. The author’s photograph of 2015