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NOTE: Clearances may only be reduced by means approved by the regulatory authority having jurisdiction. WE RECOMMEND that you have a qualified building inspector and your insurance company representative review your plans before and after installation. 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 acceptable. (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 noncombustible 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 acceptable. Converting k to R: Divide 1 by k and multiply the results times the thickness in inches of the material. R = 1/k x inches of thickness Converting R to k: 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. Divide 0.6 by .75 = k value of 0.80. This k value is smaller than 0.84 and therefore is acceptable. Page 8250-5763C September 1, 2008 Isle Royale Wood Stove R REVERSIBLE FLUE COLLAR The flue collar is reversible for either a top or rear venting installation. The unit is shipped with the flue collar in the top vent position. CONVERTING COLLAR FOR REAR VENT INSTALLATION 1. Remove 5 Phillips head screws from the rear shield, lift shield up and set aside. 2. Remove bolts from each side of the flue transition (2 total). (Place your free hand in flue opening to locate and retrieve nuts attached to bolts.) 3. Turn vent to horizontal position. Inspect sealant to ensure a leak free application. 4. Re-assemble in reverse order. REAR FLUE DEFLECTOR COVER PLATE This cover plate is used when the flue collar is turned for a rear vent application. Please note this cover plate will not work with the Low-Profile Kit Mounting Screws 1. After the flue collar has been reversed for a rear vent installation, install the cover plate on the stove with the two screws provided. Bend Flange Down 2. Bend the cover plate flange down. 3. Secure the cover plate with the remaining two screws. September 1, 2008 250-5763C Page 9 RR Isle Royale Wood Stove CHIMNEY HEIGHT REQUIREMENTS / DRAFT To be sure that your stove burns properly, the chimney draft (static pressure) should be approximately -.04” water column (W.C.) during a low burn and -.10” W.C. during a high burn, measured 6 inches (152mm) above the top of the stove after one hour of operation at each burn setting. NOTE: These are guidelines only, and may vary somewhat for individual installations. The stove was designed for and tested on a 6 inch (152mm) chimney, 12 ft.-14 ft. (360-420cm) high, measured from the base of the stove. The further your stack height or diameter varies from this configuration, the possibility of performance problems increases. In addition, exterior conditions such as roof line, surrounding trees, prevailing winds and nearby hills can influence stove performance. A masonry chimney or a listed factory-built UL103 HT Class “A” chimney must be the required height above the roof and any other nearby obstructions. The chimney must be at least 3 ft. (91cm) higher than the highest point where it passes through the roof and at least 2 ft. (61cm) higher than the highest part of the roof or structure that is within 10 ft. (305cm) of the chimney, measured horizontally. See 2-10-3 Rule below. These are safety requirements and are not meant to assure proper flue draft. We recommend using a minimum total system height of 12 ft. (360cm), measured from the flue collar to the top of the chimney (not including chimney cap). 3 ft Min (91cm) 2 ft Min (61cm) 10 ft Min (305cm) 2-10-3 RULE A proper amount of flue draft is required to assure the safe and efficient operation of the this woodstove. Flue draft is measured as negative pressure in the chimney. The amount of negative pressure determines the strength of the draft. This draft performs two important roles in the operation of the woodstove. It draws the combustion air into the firebox, and pulls the smoke out of the chimney. Three factors work together as a system to create the flue draft; 1) availability of combustion air; 2) heat generated from the fire, and 3) diameter and height of the flue system.. Increasing or decreasing any one of them will affect...
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