Vogelzang International Stove TR008 Manuale Utente

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DURANGO™

 

TR008 / 050207.2

This stove has been tested for and must be installed on a floor protector with the proper Thermal 

Resistance or R-value as stated in the installation instructions on page 3, “Locating Stove” step 1, of 

this manual. If the floor protector materials listed in the instructions are not available, materials with 

an equivalent R-value may be substituted. 

Alternate  materials  may  be  rated  with  C-factor  (Thermal  Conductance)  or  k-factor  (Thermal 

Conductivity) ratings which must be converted to R-value to determine if the alternate material meets 

the tested requirements. The following instructions provide the proper information and formulas for 

conversion to R-value.

To determine if alternate materials are acceptable follow this sequence.

1.  Convert material specifications to R-value:
 

a. R-value given — no conversion necessary

 

b. k-factor is given with a required thickness (T) in inches:

 

 

R = 1/k x T

 

c. C-factor is given: R = 1/C

2.  Determine the R-value of proposed alternate floor protector:
 

a. Use formulas in step 1 above to calculate R-value of proposed material(s). 
 

b. For multiple layers, add R-values of each layer to determine overall R-value.

3.  If the overall R-value of the floor protector system is equal to or greater than the floor protector 

specifications given, the alternate is acceptable.

Definitions:
 

Thermal conductance (C) =  

BTU 

= 

W

 

 

(hr)(ft

2

)(°F) 

 

(m

2

)(°K) 

 
 

Thermal conductivity (k) = 

(Btu)(inch) 

= 

W 

= 

Btu 

 

 

(hr)(ft

2

)(°F) 

 

(m)(°K) 

 

(hr)(ft)(°F) 

 

 

Thermal resistance (R) = 

(ft

2

)(hr)(°F) 

= 

(m

2

)(°K) 

 

 

Btu 

 

W 

Example:

The specs of floor protector material should be 3/4-inch thick material with a k-factor of 0.84.

The proposed alternative material is 4” brick with a C-factor of 1.25 over 1/8-inch mineral board 

with a k-factor of 0.29.

Step 1: Convert specs to R-value. 

 

 

R = 1/k x T = 1/0.84 x 0.75 = 0.893   System must have a R-value of 0.893 = Rspecs

Step 2: Calculate R-value of individual components

 

 

4” Brick with C-factor = 1.25.  R = 1/C = 1/1.25 = 0.80 = Rbrick

 

 

1/8-inch (0.125”) mineral board with k-factor = 0.29. R = 1/0.29 x 0.125 = 0.431 = Rmin.brd.

Step 3: Add R-values of components to get total R-value of system

 

 

Rbrick + Rmin.brd = 0.80 + 0.431 = 1.231 = Rsystem

Step 4: Compare Rsystem to Rspecs

 

 

Rsystem  =  1.231  is  larger  than  Rspecs  of  0.893.  System  R-value  exceeds    the  required  

 

 

specifications and therefore is an acceptable alternative.