A: Flare Fireplaces provides Free Flow sizing guidelines to ensure proper airflow and safe
operation. The required louver size depends on the fireplace model and whether it is used for Heat
Release or Air Intake.
Heat Release Louvers (Free Flow):
These are required to allow heat to escape from the enclosure. Typical sizing includes:
100 sq in → Flare 25, 30, 45, 50
140 sq in → Flare 60, 70 (Traditional/Passage)
200 sq in → Flare 80, 100
Air Intake Louvers (Free Flow – Double Glass Units Only):
These provide airflow into the enclosure and are only required for double glass units.
50 sq in → Flare 25, 30, 45, 50
70 sq in → Flare 60, 70 (Traditional/Passage)
100 sq in → Flare 80
Important Notes:
An Air Intake is not required for screen units.
Heat Release and Air Intake louvers must remain unobstructed at all times.
Always follow the specific model installation manual to confirm exact requirements.
See Through and Room Definer Air Intake opening requirements are doubled.
