Quadra-Fire 31-I ACC Installation Manual

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Quadra-Fire 31-I ACC Installation Manual Manual pdf 9 page image

August 3, 2015 7044-225D 931-I ACCC. Calculating Alternate Floor ProtectionMaterialThermal Conductivity: k valueThe k value indicates the amount of heat (in BTU’s) that will flowin 1 hour through 1 square foot of a uniform material 1 inch thickfor each degree (F) of temperature difference from one side ofthe material to the other.The LOWER the k factor means less heat is being conductedthrough the non-combustible material to the combustible mate-rial beneath it.The k value of a material must be equal or smaller then the re-quired k value to be acceptable.(BTU) (inch)(foot2 (hour) ( o F)Thermal Resistance: R valueThe R value is a measure of a material’s resisteance to heattransfer.R value is convenient when more than one material is usedsince you can add the R values together, whereas you cannot do this for k value.The HIGHER the R factor means less heat is being conduct-ed through the non-combustible material to the combustiblematerial beneath it.The R value of a material must be equal or larger then therequired R value to be acceptable.Converting k to R:Divide 1 by k and multiply the results times the thickness in inch-es of the material.R = 1/k x inches of thicknessConverting R to k:Divide the inches of thickness by R.k = inches of thickness/RCalculatons:Example: Floor protection requires k value of 0.84 and 3/4 inchthick.Alternative material has a k value of 0.6 and is 3/4 inch thick.Divide 0.6 by .75 = k value of 0.80. This k value is smaller than0.84 and therefore is acceptable.Figure 9.2ZEROCLEARANCEONLYRequiredThermalProtectionAdj. HearthSupport1-1/2 inch (38mm) 1 inch (25mm)1-1/2 inch (38mm)0 to 6-1/2 inch(0 to 165mm)ZEROCLEARANCEONLYRequiredThermalProtection1 inch(25mm)1 inch (25mm)Adj. HearthSupport 1-1/2 inch (38mm)6-1/2 inch(165mm )Figure 9.1Zero Clearance Floor Thermal Protection