DuraFlexSS 304 Product Catalog

TherMix
Use to ll space between a liner and inside masonry chimney.
Ready-mix formula cures into lightweight. Semi hard mass that
insulates the liner and dissipates the intense heat created in a
chimney re.
*Use Table 1 to estimate the number of TherMix bags or boxes
needed to do the job.
• Find the ue opening that comes closest to the one being lined,
the left hand column.
• Find the size of the liner to be installed across the top line.
• Where the values intersect, read the cubic foot volume of
TherMix per foot of chimney height.
• Multiply this volume by the height (in feet) of the chimney.
• Divide the cubic feet calculated in the previous step by 3.25.
This answer will determine the number of bags/boxes of
TherMix needed.
SIZE ORDER # STOCK #
BAG
RNS-TMG 810001820
BOX
RNS-TMX 810001821
TABLE 2: CROSS SECTION AREA OF LINER
Liner Size CS Area Oval Liner Size Oval Dimensions CS Area
Round 5" 19.62in2
Round 6" 28.46in2 Oval 6" (4.2" x 7.2") 24.60in2
Round 7" 38.46in2 Oval 7" (4.2" x 9.1") 32.20in2
Round 8" 50.25in2 Oval 8" (4.2 x 10.3") 37.20in2
Round 9" 62.50in2
Round 10" 78.50in2 Oval 10" (4.2" x 13.3") 49.50in2
Round 12" 113.22in2
TABLE 1: THERMIX VOLUME PER ONE FOOT OF CHIMNEY HEIGHT
Flue Opening
Diameter of Liner
5" 6" 7" 8" 10" 12"
7.5" x 7.5" .25 .20 - - - - - - - -
7.5" x 11.5" .46 .40 (Ovalized) .38 (Ovalized) .32 - - - -
8.5" x 8.5" .36 .30 .23 - - - - - -
8.5" x 11.5" .54 .48 .41 (Ovalized) .36 (Ovalized) .33 - -
9.5" x 9.5" .49 .43 .36 .27 - - - -
11.5" x 11.5" .78 .72 .65 .60 .37 - -
11.5" x 16.5" 1.18 1.12 1.05 .96 .77 - -
12.5" x 12.5" .95 .88 .82 .73 .53 - -
14.5" x 14.5" 1.30 1.26 1.20 1.10 .92 .65
14.5" x 18.5" 1.70 1.66 1.60 1.50 1.30 1.04
Packages of
TherMix
=
(W" x D" x H") - (CS x H")
1728 cu. in.
÷ 3.25
Example:
A 28' chimney with a flue opening of
8.5" x 8.5" is to be lined with a 6" liner.
As shown in Table 1, .30ft
3
of TherMix
is needed per foot of chimney height.
Multiply .30 by 28 (the height of the
chimney), to get 8.4ft
3
. Now divide 8.4
by 3.25 (the approximate volume yield
per bag of TherMix), to obtain 2.6 bags/
boxes of TherMix to complete
the installation.
*Masonry chimneys are not uniform
structures. Have extra bags/boxes
available in case you need them. If there
is an installation not covered by table 1,
refer to the formula below:
W = Width of flue opening (in inches)
D = Depth of flue opening (in inches)
H = Height of flue (in inches)
CS = Cross Section areas of chimney liner (table 2)
Insulation
DuraFlex | Stainless Steel Flexible Relining
DuraVent | www.duravent.com
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