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Round Chimney Caps: How to Measure and Select

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HomeArticle Library >  Round Chimney Caps Measuring > 

Round Flue Measuring Guide

How to Select and Measure for Chimney Caps
for Any Round Flue
© 2010 PennVentures, Inc.

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

Masonry Clay Flue, Terra Cotta Flue Pipe

Clay Pipe

Rigid Metal Pipe such as a Stovepipe

Rigid Metal Pipe

Flexible Metal Flue Liner

Flexible Liner

Double Walled: Two Concentric Pipes with Air Space Between
2 Concentric Pipes with Air Space Between

Solid Pack: Two Concentric Pipes with Covered Insulation

2 Concentric Pipes with Covered Insulation

2 Concentric Pipes with Exposed, Visible Insulation

2 Concentric Pipes with Exposed Insulation

Triple Walled: 3 Concentric Pipes with Air Between

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.

Masonry Clay Flue, Terra Cotta Flue Pipe

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.

Chimney Caps: Copper Chimney Caps for Metal or Clay Lines, Flues, Whitecaps
Copper Clamp
Chimney Caps

Chimney Caps: Chimney Caps for Metal or Clay Lines, Flues, Whitecaps

Stainless Steel Clamp
Chimney Caps

Large selection of chimney caps including this HomeSaver Pro Stainless Steel Round Chimney Cap.

Stainless Steel HomeSaver Pro Chimney Caps

Chimney Caps: Chimney Caps for Masonry Flues, Chimney Caps for Liners by Chim Cap

Bolt-On Forever Chimney Caps

Large selection of chimney caps including this HomeSaver Pro Galvanized Round Chimney Cap.

Galvanized HomeSaver Pro Chimney Caps

 

 

 

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 Chinney Caps: Copper Chimney Caps for Stove Pipes, Liner Systems, Masonry Round Flues
Copper Top
Chimney Caps




Large selection of chimney caps including this Chim Cap Stainless Steel Forever Round Chimney Cap.
Slip-In Forever Chimney Caps


Chimney Caps: Vacu-Stack Chimney Caps Eliminate Smoky Fireplace Draft

Vacu-Stack Chimney Caps
(for fireplaces that are smoky on windy days)

Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.
Large selection of chimney caps including this Adaptors for Exhausto Fans for Round, Class-A Installation.
Exhausto Fans with Adapters
(for smoky fireplaces)


Single Metal Round Flue Pipes

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

Single Metal Pipe such as a Stovepipe

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

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.

Chimney Caps: Copper Chimney Caps for Metal or Clay Lines, Flues, Whitecaps
Copper Clamp Caps

Chimney Caps: Chimney Caps for Metal or Clay Lines, Flues, Whitecaps

Stainless Steel Clamp
Chimney Caps

Chimney Caps: Chimney Caps for Masonry Flues, Chimney Caps for Liners by Chim Cap

Bolt-On Forever Chimney Caps

Large selection of chimney caps including this HomeSaver Pro Stainless Steel Round Chimney Cap.

Stainless Steel HomeSaver Pro Chimney Caps

Large selection of chimney caps including this HomeSaver Pro Galvanized Round Chimney Cap.

Galvanized HomeSaver Pro Chimney Caps

 

 

 

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.

Copper Chinney Caps: Copper Chimney Caps for Stove Pipes, Liner Systems, Masonry Round Flues
Copper Top
Chimney Caps



Large selection of chimney caps including this Chim Cap Stainless Steel Forever Round Chimney Cap.
Slip-In Forever Chimney Caps


Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.
Large selection of chimney caps including this Adaptors for Exhausto Fans for Round, Class-A Installation.
Exhausto Fans with Adapters
(for smoky fireplaces)

 


Round Flexible Flue Liners

Below is a Flexible Metal Flue Liner .

Round Flexible Metal Flue Liner

A 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 Chinney Caps: Copper Chimney Caps for Stove Pipes, Liner Systems, Masonry Round Flues
Copper Top
Chimney Caps


Large selection of chimney caps including this Chim Cap Stainless Steel Forever Round Chimney Cap.
Slip-In Forever Chimney Caps

Large selection of chimney caps including this HomeSaver Pro Stainless Steel round Guardian Cap.

HomeSaver Pro Guardian Chimney Caps

Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.
Large selection of chimney caps including this Adaptors for Exhausto Fans for Round, Class-A Installation.
Exhausto Fans with Adapters
(for smoky fireplaces)


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 Wall Air Insulated Flue

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.
 

What to Measure: Measure the insideMeasure the inside diameter of the innermost pipe and the outside diameter of the outermost pipe; the bottom collar of the chimney cap should be large enough to cover the outermost pipe. 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.

Chimney Caps: Weathershield Chimney Caps, Chimney Caps for Double Walled Chimneys, Chimney Caps for Triple Walled Chimneys

Weathershield for Double or Triple Wall Flues

Chimney Caps: Vauc-Stack Chimney Caps, Vauc-Stack Chimney Caps for Double Walled  or Triple Walled Flues

Vacu-Stack for
Air Cooled Flues

Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.

Exhausto Fans with
Air Cooled Adaptor


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 .

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.
 

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).

Large selection of chimney caps including this HomeSaver Pro Stainless Steel round Guardian Cap.

HomeSaver Pro Guardian Chimney Caps

Chimney Caps: Weathershield Chimney Caps for Round Flues

Weathershield for Solid-Pack Insulated Flues

Chimney Caps: Vacu-Stack Chimney Caps Eliminate Smoky Fireplace Draft

Vacu-Stack Chimney Caps
(for fireplaces that are smoky on windy days)

Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.

Exhausto Fans with
Solid-Pack Adaptor


Exposed Insulation Solid Pack Round Flues

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

Solid Pack Flue with Exposed Insulation

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.

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).

 

 

Chimney Caps: Vauc-Stack Chimney Caps, Vauc-Stack Chimney Caps for Double Walled  or Triple Walled Flues

Vacu-Stack
Chimney Cap for
Exposed Insulation Flues

 

 


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.

Triple Wall Air Cool, Triple Wall Air Insulated 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.
 

What to Measure: Measure the insideMeasure the inside diameter of the innermost pipe and the outside diameter of the outermost pipe; the bottom collar of the chimney cap should be large enough to cover the outermost pipe. 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.

Chimney Caps: Weathershield Chimney Caps, Chimney Caps for Double Walled Chimneys, Chimney Caps for Triple Walled Chimneys

Weathershield for Double or Triple Wall Flues

Chimney Caps: Vauc-Stack Chimney Caps, Vauc-Stack Chimney Caps for Double Walled  or Triple Walled Flues

Vacu-Stack for
Air Cooled Flues

Large selection of chimney caps including this Exhausto Fans, a combination exhaust fan and chimney cap.

Exhausto Fans with
Air Cooled Adaptor


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.

 

 

 

FireplaceMall Article Library Index
 

Chimney Caps for Round Flues Articles

Picture Guide to Types of Round Flues: Help Selecting the Appropriate Chimney Cap for Round Flues
 

Quick and Easy Selection Guide for Chimney Caps
for ROUND Flues

 

How to Install Your Chimney Cap
 

 

 

 

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