Specification

Measured Air Leakage Through Fireplaces with Damper Open, Damper
Closed, and Fireplace Plug in Place
0
20
40
60
80
100
120
12345678
House Number
Air Leakage Area (ELA
)
Damper Open Damper Closed Fireplace Plug in Place
Fireplace dampers are energy losers. One remarkable documentation of that fact
is an Eight Home Study which shows that an open fireplace can significantly
raise over-all heating energy consumption.
Note 80% of dampers were found in the open position!