Hearth and Home Technologies CUMBGAP-MBK Horizontal Venting, USA Required Canada Recommended

R

Cumberland Gap Wood Stove

CORNER INSTALLATIONS - USA ONLY

SIDE FUEL DOOR LOCKED SHUT

		52"
	coverage	optional
optional	-5/8"	coverage
	34

Calculating Alternate Floor Protection Material

Thermal Conductivity: k value

The k value indicates the amount of heat (in BTU’s) that will flow in 1 hour through 1 square foot of a uniform material 1 inch thick for each degree (F) of temperature difference from one side of the material to the other. The LOWER the k factor means less heat is being conducted through the non-combustible material to the combustible material beneath it. The k value of a material must be equal or smaller then the required k value to be accept- able.

52"

optionalcoverage

fuel	door
Front
loading

-5/8”	8"
38

16" required

8"

coverage

-3/8" 30

(BTU) (inch) (foot2 (hour) (oF)

Thermal Resistance: R value

The R value is a measure of a material’s resisteance to heat transfer. R value is convenient when more than one material is used since you can add the R values together, whereas you can not do this for k value. The HIGHER the R factor means less heat is being conducted through the non-combustible material to the combustible material beneath it. The R value of a material must be equal or larger then the required R value to be accept-

BOTH FUEL DOORS ACCESSIBLE

		48-7/16"
53-7/16"	optional coverage

able.

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 thickness

Converting R to k:

optional coverage

38-5/8"

44-3/4"
	optional
	coverage
Fuel loading	16"
door

Divide the inches of thickness by R.

k = inches of thickness/R

Calculatons:

Example: Floor protection requires k value of 0.84 and 3/4 inch thick.

Alternative material has a k value of 0.6 and is 3/4 inch thick.

	8"	25-3/4"
	16"
	required coverage
11-1/8"	18-5/8"

Divide 0.6 by .75 = k value of 0.80. This k value is smaller than 0.84 and therefore is acceptable.

HORIZONTAL VENTING

NOTE: Drawings are for illustration purposes only and are not to scale.

Floor protection must extend length of flue and 2" (51mm) beyond each side of pipe (shaded area)

USA - Required

CANADA - Recommended

Page 8 7006-188E September 1, 2008