Minimum Permanent Free Opening, Square Inches

for Masonry Built Fireplaces

Chimney Height (Feet)

18” Log Set

24” Log Set

 

Minimum Opening (Square Inches)

 

 

 

6

49.2

56.6

 

 

 

8

45.5

52.4

 

 

 

10

41.7

48.2

 

 

 

15

37.7

43.2

 

 

 

20

34.3

39.8

 

 

 

30

31.2

35.9

 

 

 

Table 1

Minimum Permanent Free Opening, Square Inches

for Factory Built Fireplaces

Chimney Height (Feet)

18” Log Set

24” Log Set

 

Minimum Opening (Square Inches)

 

 

 

10

35.3

44.2

 

 

 

15

26.4

32.2

 

 

 

20

22.1

26.4

 

 

 

25

18.1

22.9

 

 

 

30

17.3

20.4

 

 

 

35

15.9

18.9

 

 

 

40

15.2

18.1

 

 

 

Table 2

3

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Image 3
Heatmaster Gas Burner manual Chimney Height Feet Log Set

Gas Burner specifications

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