Not sure what type it is, could be a "B" vent and they are useless for putting out any heat. Vent free's are outlawed in some cities, and many codes prevent them from being installed in bedrooms and sometimes bathrooms (CO).

The best type of fireplace is the "Direct Vent" In most cases you can identify these as they have a "Double wall Tube" coming out of them, either from the top or the back.
The actual combustion chamber is completely sealed on a direct vent. It draws the air it needs from the outside portion of that tube, and exaust the combusted products through the inside part of that tube, thus the outside part of the tube stays cool and these type of fireplaces can be installed "virtually anywhere"

Unfortunately even things here , with direct vent fireplaces are not that simple. There are some made, (Usually larger ones), that throw out little heat--they are rated for "entertainment" or some fool thing!!!
The ones that throw out the heat are rated as a heating appliance, and throw out heat , they do. We have a Valor
and it heats the whole downstairs of our 2700 sq ft house.
Fortunately, it has a hand held remote, as well as a thermostat mode, that will adjust the flame up/down as needed to keep the room (or wherever you have that remote), to the desired temperature.

I Hope you are able to do something with yours, but if not,
hopefully I have provided you with some "Ammunition" for the saleman! (LOL)

Good luck, hope you are able to stay warm!

Gary