Round Flue Measuring Guide
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How to Select and Measure for Chimney Caps
for Any Round Flue
© 2010 PennVentures, Inc.
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Look at the 7 illustrations below and click on the one that looks like your round flue.
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Clay Pipe |
Rigid Metal Pipe |
Flexible Liner |
2 Concentric Pipes
with Air Space Between
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2 Concentric Pipes with Covered Insulation |
2 Concentric Pipes with Exposed Insulation |
3 Concentric Pipes with Air Space Between |
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Round Clay Flues
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Below is a Clay Flue
, a terra cotta pipe also known as a Masonry Flue.
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For Clay or Masonry Flues, you have your choice of
- chimney caps that attach to the outside of the flue or
- chimney caps that slip into the flue
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The chimney caps below fasten to the outside of round clay flues.
What to Measure: Measure the
outside diameter of your flue to select the appropriate size chimney cap.
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Copper Clamp
Chimney Caps
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Stainless Steel Clamp
Chimney Caps
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Stainless Steel HomeSaver Pro
Chimney Caps |
Bolt-On Forever Chimney Caps
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Galvanized HomeSaver
Pro Chimney Caps |
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The chimney caps below slip into round clay flues. (If your clay flue protrudes less than an inch above your chimney crown, we
suggest one of these.)
What to Measure: Measure the inside diameter of
your flue to select the appropriate size chimney cap.
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Copper Top
Chimney Caps
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Slip-In Forever Chimney Caps
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Vacu-Stack Chimney Caps
(for fireplaces that are smoky on windy days) |
Exhausto Fans with Adapters
(for smoky fireplaces)
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Single Metal Round Flue Pipes
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Below is a flue that is a Single Metal Pipe
such as a Stovepipe.
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For Single Metal Pipe Flues such as Stovepipes, you have your choice of
- chimney caps that attach to the outside of the flue or
- chimney caps that slip into the flue
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The chimney caps below fasten to the outside of single metal pipe flues such as stovepipes.
What to Measure: Measure the outside diameter of your flue to select the appropriate size
chimney cap.
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Copper Clamp Caps
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Stainless Steel
Clamp
Chimney Caps |
Bolt-On Forever
Chimney Caps |
Stainless Steel
HomeSaver Pro Chimney Caps
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Galvanized HomeSaver Pro Chimney Caps
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The chimney caps below slip into single metal pipe flues such as stovepipes.
What to Measure:
Measure the inside diameter of your flue to select the appropriate size chimney cap.
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Copper Top
Chimney Caps
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Slip-In Forever
Chimney Caps
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Exhausto Fans
with Adapters
(for smoky fireplaces)
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Round Flexible Flue Liners
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Below is a Flexible Metal Flue Liner
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A Flexible Metal Flue Liner requires a chimney cap with a base that inserts into the flue, such as the
ones below.
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What to Measure: Measure the inside diameter
of your flue to select the appropriate size chimney cap.
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Copper Top
Chimney Caps
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Slip-In Forever
Chimney Caps
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HomeSaver Pro
Guardian Chimney Caps |
Exhausto Fans
with Adapters
(for smoky fireplaces)
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Round Double Wall Flues
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Below is a flue that is a cut-away illustration of a
Double Walled Air Insulated Flue or a Double Walled Air Cooled Flue.
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A Double Wall Air Cooled flue is 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. This type of flue requires a chimney cap specially designed to allow the air circulation that is needed.
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What to Measure: Measure the
inside diameter of the innermost pipe
(the flue) and the outside diameter of the outermost pipe. Select a chimney
cap that is nominally the same diameter as your innermost pipe. (Example: a 6 inch flue uses a 6 inch Weathershield
or Vacu-Stack chimney cap). The bottom collar (indicated by the red arrows in the diagram to the right)
of the chimney cap should be large enough to cover the outermost pipe of your chimney.
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Weathershield for Double or
Triple Wall Flues |
Vacu-Stack for
Air Cooled Flues |
Exhausto Fans with
Air Cooled Adaptor |
Round Solid Pack Flue
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Below is a cut-away illustration of a
Solid Pack Flue, also known as a Double Wall Insulated or Solid Pack Insulated Flue
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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.
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What to Measure: Measure the inside diameter of the innermost pipe
(the flue). Select a chimney cap that is nominally the same diameter as your flue. (example: a 6 inch flue uses a 6 inch Weathershield, Homesaver Pro, or Vacu-Stack chimney cap).
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HomeSaver Pro
Guardian Chimney Caps |
Weathershield for Solid-Pack Insulated Flues |
Vacu-Stack
Chimney Caps
(for fireplaces that are smoky on windy days) |
Exhausto Fans with
Solid-Pack Adaptor |
Exposed Insulation Solid Pack Round Flues
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Below is a cut-away illustration of an
Exposed Insulation Solid Pack Flue.
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Can you actually see insulation between the two concentric pipes of your
flue? Then you have an Exposed Insulation Solid Pack flue. You will need this
style of Vacu-Stack chimney cap for Exposed Insulation Solid Pack flues.
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What to Measure: Measure the inside diameter of the innermost pipe
(the flue). Select a chimney cap that is nominally the same diameter as your Exposed Insulation Solid Pack's innermost pipe. (example: a 6 inch flue uses a 6 inch Weathershield, Homesaver Pro, or Vacu-Stack chimney cap).
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Vacu-Stack
Chimney Cap for
Exposed Insulation Flues |
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Triple Wall Air Cooled Round Flues
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Below is a cut-away illustration of a Triple Wall Air Insulated Flue
, also known as a Triple Wall Air Cooled Flue.
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Triple Wall Air Insulated flues 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.
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What to Measure: Measure the inside diameter of the innermost pipe
(the flue) and the outside diameter of the outermost pipe. Select a chimney
cap that is nominally the same diameter as your innermost pipe. (Example: a 6
inch flue uses a 6 inch Weathershield or Vacu-Stack chimney cap). The bottom collar (indicated by the
red arrows in the diagram to the right)
of the chimney cap should be large enough to cover the outermost pipe of your chimney.
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Weathershield for Double or Triple Wall Flues |
Vacu-Stack for
Air Cooled Flues |
Exhausto Fans with
Air Cooled Adaptor |
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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.
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