![]() ![]() In practice, joints in stovepipe connectors are not major sources of loss of draft. See solutions A, F and H.ĥ. Chimney has leaks: Any leak in the lower half of a chimney will reduce overall draft. See solution E.Ĥ. Chimney blocked: The primary causes of chimney blockage are creosote (in the chimney itself or in the spark screen of the cap), dampers that have come adrift, birds’ nests, and fallen parts of masonry chimneys. The National Fire Protection Association’s (NFPA) guidelines for chimney height should be considered minimums. In practice, chimney height is more important in limiting the effects of wind patterns produced by the building and nearby obstacles than it is in producing draft by stack effect. Thus, doubling chimney height increases draft by 41 percent. See solutions F and H.ģ. Chimney too short: Draft is proportional to the square root of the height of the chimney, assuming that other factors don’t interfere. Excess chimney area results in cooling of the flue gases and reduction of the draft, particularly in uninsulated exterior masonry chimneys. Thus a stove with a 6-inch-diameter collar shouldn’t have more than an 8-inch-diameter chimney. See solutions A, B and E for marginal improvements or solution H for the real fix.Ģ. Chimney too big: Chimneys should have no more than twice the cross-sectional area of the flue outlet on the appliance. If you don’t have that information, be sure that, as a rule of thumb, the chimney is about the same diameter (or has about the same cross-sectional area) as the flue outlet on the appliance. It’s generally safe to size a chimney to the recommendations of the woodburner’s manufacturer. Chimney too small: Unless you have a very large wood-burning heater, it’s unlikely that your chimney has inadequate capacity. If your house constantly smells of smoke, even when you haven’t lit a fire, see problems No. 6 and 8.ġ. Smoke odors are persistent, even when stove isn’t in use. If, in spite of a wide-open damper, the woodburner doesn’t become very hot, see problems No. 1, 2, 4, 5 and 6. If you get smoke leaking into the room when you open the damper for greater heat output, see problems No. 1 through 6. If there is periodic (or even consistent) smoke spillage under almost any burn condition, see problems No. 1 through 7. Smoke spills to some degree under all conditions. If this is the only time you have chimney draft problems, see problem No. 8. ![]() Stove back puffs powerfully on windy days. Some chimneys perform adequately only after the first 30 to 60 minutes of burning. (Open appliances, such as Franklin stoves and fireplaces, are separate matters.) Just pick out the symptoms you’re suffering from on the list that follows, move on to the numbered problems included with your symptom and then proceed to the lettered solutiona mentioned with each problem.įire is reluctant to start and smoke spills into room at start-up. The object of this article is to help you diagnose and solve chimney problems related to airtight wood-burning heaters - without worrying too much about the physics of chimneys. The important thing to remember is that you’ll get nowhere if you go after the wrong problem. In most cases, more draft will equal more flow, but it’s conceivable that you could have lots of draft but inadequate capacity if the diameter of your chimney is very small. Draft is the force behind flow, while capacity is the capability to handle flow. There are actually two distinct (though related) factors affecting chimney performance: draft and capacity. If you ever need assistance choosing the right Blower Motor, Gaskets Burner, Electric Heat Kit, Flame Sensor, Flue Part, Gas Valve, Heat Exchanger, Ignitor, Induce Draft Blower, LP Conversion Kit, Pilot Burner, Pilot Orifice, Pressure Switche, Thermocouple, Blower Part, Cabinet Part, or Control Board please contact us via Live Chat or call us at 1-86.Does your woodstove have the hiccups? Does your house smell of smoke much of the time? Do you have a heck of a time getting a fire started? If you have one (or all) of these problems, don’t blame the heater. We have a knowledgeable and friendly staff ready to assist you. We sell original equipment manufacturer (OEM) parts from most brands, including Lennox, Carrier, Bryant, Rheem, Ruud, Goodman, Armstrong, Trane, York, etal. is your #1 internet source for HVAC repair parts. In this section displayed are many replacement elements for repairing various HVAC applications. The components include Cold End Collector Boxes, Condensate Collars, Exhaust Assemblies, Flow Regulators, Drain Traps and other important components designed to prevent discharge of dangerous combustion materials into living spaces. Flue Parts safely recirculate and expel combustion gases and moisture from the furnace. ![]()
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