When i was checking plans of Boiler Rooms Nos 1 & 2 i found something that i did not notice before. Looks like the wall of fidley which is facing to lower funnel is extending down to the level of G deck beams in Boiler Room. I did a bit of research into this and found that this structure is called air screen.
I found only 2 books which are talking a bit more about them. Those books are 'Machinery and Pipe Arragement on Shipboard' and 'The Marine Steam Engine'. These books, especially the first one also consist plans of Boilers Rooms where those air screens are visible. And this is a moment where i'm confused.
The reason for why i'm confused is that in case of Titanic Boiler Rooms, those air screens are visible on Longitudinal Plan only. They are nof included on other plans of those spaces. And a question that raising in my mind is: What shape those air screens had?
The picture below shows three possibilities that i think are plausible.
1. Red - air screen is following the shape of the boiler uptakes 2. Green - air screen extends to full width of F deck level and goes down to uptake, then extends further outward to match the shape of uptake. 3. Yellow - air screen extends to full width of F deck level, then extends further outward to columns on G deck level of Boiler Room.
I also think that the inner walls of coal bunkers on G deck also had air screens.
Problem is that i do not have any more information that would give me a possiblity to say what version is correct. Any thoughs?