The closedfireplace,castheaterwithhood(bonnet)operates bynaturalconvectionairisheated in thecladdingmasonrychimneyanddischargedby gridsarranged in thehood.Hot air isalsodiffused by theradiation from theceramicglass.
The craze forclosed fireplacesis explainedin particular bythe use of wood,a renewable energybackinto fashionin recentyears,offeringcarbon neutralwhile remaininginexpensive