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Round Flue Chimney Cap Guide

Round Flue Chimney Cap Guide
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How to Select and Measure for Any Round Flue Chimney Cap

Look at the 7 illustrations of flues below and click on the one that looks like your round flue.

clay round flue Round Flue Chimney Cap Guide of Rigid Pipe Round-Flexible-Liner-200x13 Double_Walled
Clay Pipe Rigid Metal Pipe Flexible Liner 2 Concentric Pipes
with Air Space Between
Round Flue Chimney Cap Guide for Covered Insulation Flue Round Flue Chimney Cap Guide for Exposed Insulation Flues Round Flue Chimney Cap Guide for Triple Walled Flue
2 Concentric Pipes
with Covered Insulation
2 Concentric Pipes
with Exposed Insulation
3 Concentric Pipes
with Air Space Between

 Round Clay Flues

Below is a Clay Flue , a terra cotta pipe also known as a Masonry Flue.

clay round flue

 

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

 

 

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.

HomeSaver Pro Round Stainless Steel Chimney Cap Bolt-On forever Chimney Cap copper clamp chimney cap for round flues

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.

Copper Top for Round Flue SlipIn-forever-Chimney-Cap VacuStack Chimney Cap for Round Flues

Single Metal Round Flue Pipes

Below is a flue that is a Single Metal Pipe such as a Stovepipe.

Round Flue Chimney Cap Guide of Rigid PipeFor 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

 

 

Each round flue chimney cap below fastens 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.

copper clamp chimney cap for round flues HomeSaver Pro Round Stainless Steel Chimney Cap Bolt-On forever Chimney Cap

Each round flue chimney cap below slips 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.

SlipIn-forever-Chimney-Cap Enervex-for-Round-Flues Copper Top for Round Flue

 

Round Flexible Flue Liners

Below is a Flexible Metal Flue Liner

Flexible linerA Flexible Metal Flue Liner requires a chimney cap with a base that inserts into the flue, such as the ones below.

 

 

What to Measure: Measure the inside diameter of your flue to select the appropriate size chimney cap.

Copper Top for Round Flue HomeSaver Guardian Chimney Cap SlipIn-forever-Chimney-Cap

 

Round Double Wall Flues

Below is a flue that is a cut-away illustration of a Double Walled Air Insulated Flue or a Double Walled Air Cooled Flue.

Double Walled FlueA 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 round flue chimney cap specially designed to allow the air circulation that is needed.

 What to Measure: Measure the inside diameter of the innermost pipe and the outside Bottom Collar and Inner Diameter of Innermost Fluediameter of the outermost pipe; the bottom collar of the chimney cap should be large enough to cover the outermost pipe.

Select a round flue 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.

WeatherShield for Air Cooled Flues VacuStack for Air Cooled Flues Enervex Fan with Adapter for Round Flues

 

 Round Solid Pack Flue

Below is a cut-away illustration of a Solid Pack Flue, also known as a Double Wall Insulated or Solid Pack Insulated Flue .

Round Flue Chimney Cap Guide for Covered Insulation FlueInsulation 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.

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).

WeatherShield for Solid Pack Flues HomeSaver Guardian Chimney Cap VacuStack Chimney Cap for Round Flues

 

Exposed Insulation Solid Pack Round Flues

Below is a cut-away illustration of an Exposed Insulation Solid Pack Flue.

Round Flue Chimney Cap Guide for Exposed Insulation FluesCan you actually see insulation between the two concentric pipes of your flue? Then you have an Exposed Insulation Solid Pack flue. You will need the style of Vacu-Stack chimney cap for especially designed forExposed Insulation Solid Pack flues.

What to Measure: Measure the inside diameter of the innermost pipe (the flue).  Select a round flue chimney cap that is nominally the same diameter as your Exposed Insulation Solid Pack’s innermost pipe.VacuStack for Exposed Insulation

 

Triple Wall Air Cooled Round Flues

Below is a cut-away illustration of a Triple Wall Air Insulated Flue , also known as a Triple Wall Air Cooled Flue.

Round Flue Chimney Cap Guide for Triple Walled Flue
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. This type of flue requires a chimney cap that can circulate air between the flues to cool them.

 

What to Measure: Measure the inside diameter of the innermost pipe and the outside Bottom Collar and Inner Diameter of Innermost Fluediameter of the outermost pipe; the bottom collar of the chimney cap should be large enough to cover the outermost pipe.

Select a round flue 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.

VacuStack for Air Cooled Flues WeatherShield for Air Cooled Flues Enervex Fan with Adapter for Round Flues
© 2015 FireplaceMall.com and PennVentures, Inc.
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About

Tom has been writing for the FireplaceMall.com blog since 2011 and has loved sitting in front of the fireplace since he was an itty-bitty boy.

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