_w_ Opening Width
_h_ " Height
_d_ Depth
_c_ Minimum back (horizontal)
_a_ Vertical back wall
_b_ Inclined " "
_o_ Outside dimensions of standard flue lining
_i_ Inside diameter of standard round flue lining
_w_ _h_ _d_ _c_ _a_ _b_ _o_ _i_
------+-------+--------+-------+-------+-------+--------+-------
Inches Inches Inches Inches Inches Inches Inches Inches
24 24 16-18 14 14 16 8½ by 8½ 10
28 24 16-18 14 14 16 8½ by 8½ 10
24 28 16-18 14 14 20 8½ by 8½ 10
30 28 16-18 16 14 20 8½ by 13 10
36 28 16-18 22 14 20 8½ by 13 12
42 28 16-18 28 14 20 8½ by 18 12
36 32 18-20 20 14 24 8½ by 18 12
42 32 18-20 26 14 24 13 by 11 12
48 32 18-20 32 11 24 13 by 13 15
42 36 18-20 26 11 28 13 by 13 15
48 36 18-20 32 14 28 13 by 18 15
54 36 18-20 38 14 28 13 by 18 15
60 36 18-20 44 14 28 13 by 18 15
42 40 20-22 24 17 29 13 by 13 15
48 40 20-22 30 17 29 13 by 18 15
54 40 20-22 36 17 29 13 by 18 15
60 40 20-22 42 17 29 18 by 18 18
66 40 20-22 48 17 29 18 by 13 18
72 40 22-28 51 17 29 18 by 18 18
[Illustration: Figure 33.--In regions where natural gas is plentiful and
in cities, fireplaces of this type, burning gas with a flickering flame,
are frequently used as an auxiliary to the main heating plant. Some types
have imitation logs of metal perforated for gas jets.]