FIREPLACE SIZES
Front Width
Center Width
Back Width
TABLE I
Minimum
Minimum Front
Minimum
Minimum
Set Size Center Width
Opening Width
Depth
Height
21
28”
30”
16”
16”
24
32”
36”
16”
16”
30
37”
42”
16”
16”
29
39 51
64
Appliance Input Rating, Btu Per Hour (w)
Chimney
Height,
Feet
6
34,000
46,400
62,400
80,000
8
37,000
50,400
68,000
86,000
10
40,400
55,800
74,400
96,400
15
44,600
62,400
84,000
108,800
25
50,400
68,400
94,000
122,200
30
55,200
76,800
105,800
138,600
Each gas appliance requires a minimum 16-inch front opening height and minimum 16-inch depth. To
determine the largest set that will fit in a fireplace, the width at the center of the fireplace is the critical
dimension. Table I below indicates the minimum center width for each size set.
*View is looking down on the fireplace floor. To determine center width, add front width and
back width and divide by 2.
TABLE II
Free opening area of chimney damper for venting combustion products from decorative
appliances for installation in vented fireplaces. Minimum size of chimney flue is 8” diameter.
Minimum Permanent Free Opening, Square Inches
3
