Clogged vents can lead to high levels of this odorless gas can easily incapacitate and not to mention kill.
Please keep burning candles away from furniture, drapes, bedding, carpets, books, paper, flammable decorations, etc. Some people use beads to make jewelry and decorations. https://Kaswece.org/bbs/board.php?bo_table=free&wr_id=2073995