Hi I have a house built in 83 with a grizzly insert. It’s non cat has no dampener. It does have side fire box controls. I can’t keep a good fire lit in then stove no matter how well my coal bed is. Seasoned wood is used. It does not have the thermal squirrel cage has been swapped with with a non thermal blower (couldn’t find and original) can anyone help. Do I need a dampener in line maybe? Thanks! The house has a Add a Furnace by Monarch which heats the house when the upstairs insert is not enough. Dealing with two extremely out dated units here lol. Thanks