Where are the braziers, and how do they add to the atmosphere in "The Masque of the Red Death"?

The braziers are in front of the window in each of Prospero's seven special rooms, add an eerie effect to each of the rooms.

The décor in Prince Prospero’s secluded abbey is designed for effect.  He carefully crafted each room to represent a stage of life, from birth to death.  The rooms are illuminated by windows and fire.

But in the corridors that followed the suite, there stood, opposite to each window, a heavy tripod,...

The braziers are in front of the window in each of Prospero's seven special rooms, add an eerie effect to each of the rooms.

The décor in Prince Prospero’s secluded abbey is designed for effect.  He carefully crafted each room to represent a stage of life, from birth to death.  The rooms are illuminated by windows and fire.

But in the corridors that followed the suite, there stood, opposite to each window, a heavy tripod, bearing a brazier of fire that protected its rays through the tinted glass and so glaringly illumined the room. And thus were produced a multitude of gaudy and fantastic appearances. 

Using a brazier, which is basically a metal bowl for holding the fire, helps create a sense of eerie debauchery.  As entertaining as the palace is, there is definitely a macabre quality to it.  Lighting the rooms with fire adds to the ambiance, and the further you go down the halls, the spookier the rooms get.

But in the western or black chamber the effect of the fire-light that streamed upon the dark hangings through the blood-tinted panes, was ghastly in the extreme …

Basically, that last room creeps everyone out.  It has an ebony clock that seems to transfix them every time it strikes the hour, and the red color also reminds them of death.  They have come to Prospero’s castle to forget their mortality, but here in this room they are staring it in the face.

Prospero seems to have a very twisted sense of humor.  First he secrets away a thousand of his closest friends for a six-month party and ignores the dying in his kingdom, and then he creates these rooms that are designed to remind people that they are going to die.  There is just nothing sane about this guy.  Of course, Prospero cannot escape death.  Even when he doesn't invite Death to the party, he invites himself.