Bard Bayrd Furnace 403293A - Manual (Page 57)

TABLE 9
MASONRY CHIMNEY UNER DIMENSIONS
WITH CIRCULAR EQUIVALENTS
NOMINAL INSIDE INSIDE DIA. EQUIVALENT
UNER SIZE DIMENSIONS IN OR EQUIVALENT AREA
INCHES UNER INCHES DIA INCHES SO. INCHES
4x8 21/2x61/2 4 12.2
5 19.6
6 28.3
7 38.3
8x8 6 3/4x6 3/4 7.4 42.7
8 50.3
8x 12 6 1\2x 10 1/2 9 63.6
10 78.5
12x 12 9 3/4x9 3/4 10.4 83.3
11 95
12x 16 9 1/2 X 13" \/2 11.8 107.5
12 113
14 153.9
16x 16 13 1/4 X 13 1/4 14.5 162.9
15 176.7
16x20 13x 17 16.2 206.1
18 254.4
20x20 16 3/4 X 16 3/4 18.2 260.2
20 314.1
20x24 16 1/2x20 1/2 20.1 314.2
22 380.1
24x24 20 1/4 x 20 1/4 22.1 380.1
24 452.3
24x28 20 1/2x241/4 24.1 456.2
28x28 241/4 x 24 1/4 26.4 543.3
27 572.5
30x30 25 1/2x25 1/2 27.9 607
30 706.8
30x36 25 1/2 X 31 1/2 30.9 749.9
33 855.3
36x36 31 1/2x31 1\2 34.4 929.4
36 1017.9
When liner sizes differ dimensionally from those sfK^wn in Table 9 equivalent
diameters may be determined from published tables for square and rectangular
ducts of equivalent carrying capacity or by other engineering methods.
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