Round Flue Picture Guide: What Different Styles Round Flues Look Like


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What Do the Different Styles of Round Flues Look Like?
A Picture Guide to Round Flues
© 2009, 2011 PennVentures Inc.

If you are not familiar with terms such as "Solid Pack," "Double Wall Air Insulate," and "Masonry Flue," have no fear! Just compare your flue with the illustrations below to determine which type or style of round flue you have. Then you will be sure you are selecting an appropriate chimney cap. Also noted are the specific models of chimney caps appropriate for each type of flue.

To the left is a cut-away illustration of a Double Wall Air Cooled flue, also known as an Double Wall Air Insulated flue. These have one pipe inside another. Air circulates in the open space between the two pipes to cool the flue. Click here to see Weathershield, or Vacu-Stack caps appropriate for Double Wall Air Cooled (Air Insulated) chimneys. Exhausto Fans are also appropriate if you also buy a Air Cooled Adaptor.

Triple Wall Air Cool, Triple Wall Air Insulated Flue

Triple Wall Air Cooled flues, also called Triple Wall Air Insulated flues, as shown in the cut-away illustration to the left, have three concentric pipes. Cooling air circulates in the open spaces both between the outermost and middle pipe and between the middle pipe and innermost pipe. Click here to see Weathershield, or Vacu-Stack caps appropriate for Triple Wall Air Cooled (Air Insulated) chimneys. Exhausto Fans are also appropriate if you also buy a Air Cooled Adaptor.

Solid Pack Flue or Double Wall Insulated flue

Insulation within the flue distinguishes a Solid Pack flue, also called a Double Wall Insulated or Solid Packed Insulated flue. In many, the actual insulation in covered, as shown in the cut-away illustration to the left, and, therefore, not visible as you look down into your flue. Click here to see Vacu-Stack, HomeSaver Pro Guardian, Weathershield, chimney caps appropriate for Double Walled Insulated (Solid Packed) chimneys. Exhausto Fans are also appropriate Double Walled Insulated (Solid Packed) chimneys, but be sure also to purchase the Solid Pack Adaptor that goes with the Exhausto Fan you select.

Can you actually see insulation between the pipes of your flue? Then you have an Exposed Insulation Solid Pack flue. You will need either a WeatherShield Chimney Cap for Air Cooled Flues or this style of Vacu-Stack chimney cap for Exposed Insulation Solid Pack flues.

To the left is a Clay Flue, also known as a Masonry Flue. These are terra cotta pipes. Click to see appropriate chimney caps for Clay (Masonry) Flues: Copper Clamp Caps, Stainless Steel Clamp Caps, Copper Tops, Stainless Steel HomeSaver Pros, Bolt-On Forever Caps, Slip-In Forever Caps, Vacu-Stacks, Exhausto Fans, and Galvanized HomeSaver Pros.

The photo shown here to the left is a flue that is a Single Metal Pipe such as a Stovepipe. Appropriate chimney caps for these include Copper Clamp Caps, Stainless Steel Clamp Caps, Copper Tops, Bolt-On Forever Caps, Slip-In Forever Caps, HomeSaver Pro Guardians, and Exhausto Fans.

This is a Flexible Metal Flue Liner. Select a chimney cap with a base that inserts INTO this type of flue such as Copper Tops, Slip-In Forever Caps, HomeSaver Pros, and Exhausto Fans with Solid Pack Adapters or select a chimney cap with a base that attaches to the OUTSIDE of the liner such as the Copper Clamp Cap or the Stainless Steel Clamp Cap (which is also available in Black or Old Penny Copper Brown).

Still have questions about just what type of flue you have or which chimney cap you should select? Just call our friendly Chimney Cap Experts at 888-834-7375 or e-mail us your question or concerns.