How do I know if I need ventless or vented for an existing fireplace?
There are several differences and issues to consider when debating vented/direct vent vs. ventless/vent-free. Please see these articles for assistance. What to Know When Buying Gas Logs. Fireplace Insert Buying Guide.
You can see the installation and maintenance instructions for the VFSR series burners here: Empire VFSR Vent-Free Burner Systems