Table of Contents
Advertisement
In the case of a known K and thickness of alternative materials to be used in combination,
convert all K values to R by dividing the thickness of each material by its K value. Add R values
of the proposed materials as shown in the previous example.
Example:
Common brick K value = 5
Thickness = 4»
R value = Thickness/K = 4/5 = 0.8
Total R value = .8 + 0.52 = 1.32
9.3
Minimum Masonry Opening and Clearances to Combustibles
MINIMUM
CLEARANCES
F
19" (483 mm)
G
9 ½" (242 mm)
H
12" (305 mm)
I
12" (305 mm)
Q
84" (213 cm)
If a fresh air intake is required, it is recommended to add at least 4" to the width of the minimum opening of the hearth.
17
18
If projection kit is used L = 20
Page 32
COMBUSTIBLE MANTEL SHELF
COMBUSTIBLE
TOP SURROUND
I
G
F
FLOOR PROTECTION
L
O
P
⅛
⅛
⅛
", otherwise L = 22
" or 18
Durock K value =1.92
Thickness = 1»
R value = Thickness/K = 1/1.92 = 0.52
Q
H
J
K
MAXIMUM
THICKNESS
5" (127 mm)
12" (305 mm)
K
".
Installation and Operation Manual - Matrix 2700 Insert
P
O
MINIMUM MASONRY
OPENING
27 ⅛" (690 mm)
J
31 ¾" (806 mm)
17
22 ⅛" (562 mm)
L
18
Advertisement
Table of Contents
