Wizard wrote:I have a coal fireplace insert not sure what brand there is no name on the stove but my question is when it was installed they put a stainless liner in but no damper
they said they could not put one with that stove is the damper a necessity? Second question is when i see all your posts about filling it up do you mean all over the
bed or banking it to the sides?
They may have been referring to a barometric damper, which is difficult (if not impossible) to use with an insert, but it is possible your stove has a manual pipe damper instead. Pictures might help, including what the inside of the firebox looks like. Does it have a blower fan, to blow warm air out into the room?
Filling it up means all over the bed. There may be some situations in which you might not fill it up evenly across the entire bed but, usually, you want a deep bed of coals everywhere.