If you want to get more heat from your FireplaceFireplace blower(Fan) can give you More heat some fireplace brands are not efficient
and you waisting some heat through your Venting witch meansYour Gas Fireplace is
using More Gas to supply enough Heat and that is the meaning of not being Efficient
. when you install fan it helps to blow heat to your home and you dont need run your fireplace
All the time , fireplace fan is blowing all heat until cooling your fire box and high limit switch
turn your fan off Automatically.