gas fireplace subgroup of fireplace, 9 assertions
CapableOf 2
burn natural gas 0.81
use propane 0.49
HasPrerequisite 1
either a chimney 0.25
HasProperty 3
more efficient 0.59
safer 0.27
popular 0.16
ReceivesAction 3
vented 0.63
easy to use 0.43
sold in canada 0.41