Quadra-Fire Chimney Height Requirements / Draft, Isle Royale Wood Stove, Rule below

R

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).

	2-10-3 RULE
3 ft Min	2 ft Min (61cm)
(91cm)
	10 ft Min
	(305cm)

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 the other two and thus change the amount of draft in the entire system.

A source of air (oxygen) is necessary in order for combustion to take place. The combustion air enters the firebox below the ash catcher and is directed to the upper front of the fire- box. These openings are regulated by the Primary Air Slide Control and Start-up Air Control, (see page 17 for operation of these controls). It is important to realize that whatever combustion air is consumed by the fire must be replaced. If you are using room air, the air is replaced via air leakage that occurs around windows and under doors, etc. However, in most newly constructed houses, mobile homes, or even existing homes that are fitted with tightly sealed doors and windows, the area from which the combustion air is taken is relatively air tight. In these cases, an outside air source must be made available to feed combustion air from outside the home into the stove. An Outside Air Kit is available as an option, Part 831-1780. The kit is a requirement for mobile home installations.

A specific volume of air, determined by the diameter and height of the chimney connector and chimney, is contained within the flue system. As heat from the fire enters the flue, it warms this air causing it to rise. The air moving up the flue draws smoke and more heated air from the fire with it, thus establishing draft. The amount of draft depends on the temperature of the heated air and the volume of air that is contained in the flue system.

If the fire is difficult to start, and smoke spills out of the door, or you find it hard to establish and maintain a moderately high burn rate, then the flue draft is too low and corrective measures must be taken.

If you still suspect you have a low draft problem, it may be necessary to increase the volume of air in your flue system. Since the diameter of your flue system is matched with the size of the flue collar and should not be changed, the height of the system will need to be increased. Add chimney a little at a time until the draft improves, and ensure that the flue collar and venting section are sealed.

Your local dealer is the expert in your geographic area and can usually make suggestions or discover problems that will easily correct your flue draft problem, allowing your wood- stove and its flue system to operate correctly and provide safe and economical heat for your home.

February 4, 2005 250-5763B Page 9