![]() It's important to know how your flue is constructed when selecting a chimney cap, but you also need to be aware of your flue's shape. This kind of chimney requires a cap specifically designed for triple-wall insulated pipe and, as with other types of metal chimney pipe, it's best to use one produced by the same manufacturer. You'll find models that leave the insulation exposed as well as models that cover it with a metal cap. Triple-Wall Solid-Pack Insulated Chimneys - Triple-wall solid-pack insulated pipes feature three walls separated by some kind of insulation. They feature three concentric pipes separated by air and should be covered with a triple-wall chimney cap made by the same manufacturer whenever possible. Triple-Wall Air-Insulated - These work just like double-wall air-insulated pipes. As with air-insulated models, it's best to use a cap produced by the same manufacturer as your pipe. Both varieties require a chimney cap specifically designed for that type of double-wall solid-pack insulated pipe. In some instances the insulation is left exposed, while in others it is covered with a metal cap. Because they are so specialized, it's best to use a chimney cap produced specifically for your brand of double-wall air-insulated vent pipe when possible.ĭouble-Wall Solid-Pack Insulated Chimneys - Double-wall solid-pack insulated chimneys also feature an inner and outer wall, but use insulation to separate the two. When it comes to capping, they require products specifically designed to work with single-wall pipe.ĭouble-Wall Air-Insulated Chimneys - This kind of chimney features an inner pipe and an outer pipe separated by open space and uses air to cool the flue. This type of chimney is no longer acceptable by code and is becoming less common. ![]() ![]() Single-wall chimneys are literally just metal tubes they don't contain any insulation or other internal features. Single-Wall Metal Chimneys - If you have an older wood burning stove, there is a chance it is venting using single wall stovepipe. ![]() This kind of venting system requires a top-mounted chimney cap regardless of whether the flues are extended or not. Multi-Flue Chimneys - A multi-flue chimney, is as you've probably guessed, a chimney that houses more than one flue. When capping this kind of chimney, you have to use a slip-in model. It's unlikely that a system like this would be installed without a chimney cap, but if you look into your chimney and see a soft round metal tube, then that's exactly what you've got. Single-Flue Chimneys with Flexible Metal Liners - In these systems, the smoke from your fireplace, insert, or stove is vented through a flexible liner housed inside your chimney rather than the through the chimney itself. Capping one of these chimneys requires either a standard single-flue chimney cap with legs or brackets or a top-mounted model. Single-Flue Chimneys without Extended Flues - This kind of chimney features a flue that is completely flush with its crown. Extended flues are amongst the most common and easiest to cap - chimney caps for this kind chimney can be directly attached to the flue with clamps or screws. Single-Flue Chimneys with Extended Flues - If your chimney has a single flue that extends above its crown, this is the type of system you have. If you're not sure what type of flue you have, just take a look inside your chimney and pick the description that best matches what you saw. Below is some information about the most common flue constructions. The kind of flue you have dictates what chimney caps you can use and, consequently, the measurements you'll need to select the right one.
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