A COMBUSTION AIR CASSETTE, A FIREPLACE WITH A COMBUSTION AIR CASSETTE, A METHOD FOR SUPPLYING COMBUSTION AIR, AND A KIT FOR RETROFITTING A COMBUSTION AIR CASSETTE

The invention relates to a combustion air cassette (10) for conveying combustion air to different height levels of a furnace in a fireplace. The combustion air cassette (10) comprises a hollow primary air cassette (11) and at least one hollow secondary air cassette (12) with an air flow connection to the primary air cassette (11), and an air intake (35). Via the air intake (35), combustion air is arranged to flow into the primary air cassette (11) and further to the lower part of the furnace, below a wood charge to be placed on top of the primary air cassette (11), via primary air inlets (15); as well as into at least one secondary air cassette (12), to be preheated, and from which secondary air cassette (12) preheated secondary air is arranged to flow into the furnace, at least via secondary air inlets (16) provided at the height of the upper combustion space of the wood charge burning on the primary air cassette (11). The invention also relates to a fireplace (50) comprising a combustion air cassette (10), a method for introducing combustion air to a wood charge burning in the furnace of the fireplace, to different height levels of the furnace, by the combustion air cassette (10), as well as a retrofitting kit for a combustion air cassette.