Does this product have a check valve in it to stop the flow of air when the insert is not being used?
By Collin C. - NFI Master Hearth Professional on March 29, 2013
Most wood burning fireplaces and inserts that can accept an outside air kit will actually have an air control lever built into the unit. The lever will open and close a butterfly valve or sliding door that allows combustion air to flow through the unit.
Majestic AKU1 Outside Air Kit Termination - For Al Fresco Outdoor Wood Burning Fireplaces