Assessments - 4, GPA: 3.8
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Round chimneys are the most efficient. The interior diameter of the chimney should be identical to the stove's smoke exhaust. A chimney which is too small may cause draft problems, since it may not have the required volume to properly evacuate the quantity of smoke resulting from the combustion. A chimney which is too large may also cause draft problems. In fact, a large chimney will be harder to warm-up and may not reach high enough temperatures to create a proper draft effect. Note that it is the chimney which creates the draft effect, not your stove. Your stove's performance is therefore directly dependent on an adequate draft from your chimney. The following recommendations may be useful for the installation of your chimney: . Do not connect your stove to a chimney serving another appliance. . The chimney must rise above the roof at least 3' (0.9 mm) from the uppermost point of contact. See Figure 2.2. . The chimney must exceed any part of the building or other obstruction within a 10' (3.04 m) distance by a height of at least 2' (0.6 m). See Figure 2.2. . The minimum overall height of the chimney system, measured from the stove top to the exterior termination cap of the chimney should be at least 12' (3.66m). A chimney which is too short may lack the “tunnel effect” required to obtain a proper draft. . Installation of an interior chimney is always preferable to an exterior chimney. Chimneys constructed outside of the home on an exterior wall should be avoided if possible, especially in colder climates. The gas which circulates into an interior chimney will cool more slowly, thus reducing the build-up of creosote and the risk of flue fires. . All else being equal, cooler chimneys will have less draft than hotter ones. This problem will be amplified if the chimney is excessively long. A chimney which is excessively long may be very hard to warm-up due to its higher volume. A cool chimney may even down draft (reverse flow) due to the difficulty in heating it up to operating temperature while trying to evacuate the stack gases. . If an exterior chimney is used, the best results will be obtained by using a connector vertically off the unit to the highest possible point before elbowing off horizontally to the exterior chimney. For efficiency and safety reasons the stove must not be installed with an insulated chimney connected directly to the appliance. . Using a fire screen at the extremity of the chimney requires regular inspection in order to insure that it is not obstructed, thus blocking the draft. It should be cleaned when necessary. FIGURE 2.2 Minimum Height of the Chimney 2.2.1 Step by step installation of your factory-built chimney The way to install your chimney may vary from one chimney manufacturer to another. The instructions contained in this manual are based on the recommendations of chimney manufacturers whose products are sold at many North American retailers of wood stoves and related heating accessories. Wall support system If your chimney must rise along an outside wall, you need to connect it to your stove through an adjacent wall. In Canada the CSA B365 and the CSA C22.1 installation codes are to be followed. For this type of installation, the following items are normally required: Chimney . Suitable lengths of chimney (enough to go up to your roof) . An adjustable wall support . A wall thimble . An adequate number of wall bands (one for every 8 feet of chimney, excluding the roof portion) . A stove pipe adapter . One insulated tee & plug . A roof flashing kit (if necessary) . A chimney cap. . Roof guys (if required) Stove pipe . An adequate number of stove pipe sections. . A 90o elbow Typical installation through the wall FIGURE 2.2.1 (A) Typical installation through the wall 1- Start by positioning your stove where you would like it to go, taking into account the minimum clearances to combustible material. You will then be able to determine where the chimney will pass through the wall. You will probably have to adjust the stove position slightly to ensure that your chimney will run between the studs. You can use a stud finder to locate the studs. Use a spoke saw or jig saw to cut a hole, remembering that you need to maintain a clearance of 2 inches between the chimney and any combustible materials. For concrete walls, cut a hole slightly larger than the outer diameter of the chimney. 2- Once the opening completed, you need to frame in the area to allow for the installation of a wall thimble. A wall thimble is not required for installations through concrete walls. 3- You must first secure the wall thimble into the exterior wall surface. Then, do the same inside and fasten the trim plate. 4- Then, from outside the building, slide a short chimney length (attached to the tee) through the wall thimble. The chimney must extend at least 3 inches into the living space where it attaches to the stove pipe. 5- You can now install the wall support. Simply slide the wall support up to the tee, ens...