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Chimney Cap Measuring Tips
| There are many different styles of chimney flues
but for most applications there are 4 common styles,
choose from the list below to go to the style you
have. If the style you have is not an option
please give us a call toll free at +1 (866) 667-8454
or email us.
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| If you know what you need and are ready to place
you order please see our
Chimney Caps selection. |
| Masonry Chimneys |
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1)
Single
Flue Chimneys With Extended Flues -
(most common) These chimneys have flues that extend
out of the chimney allowing you to attach your chimney
cap with screws that tighten to the ceramic or clay
flue. You will need to measure the width and
length of the outside dimensions of the flue to
get a proper fit. Most single flue caps will
require you to have your measurements and will fit
within a range of sizes. Depending on the
length of the screws the cap will fit a range of
different flue sizes. |
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2)
Single Flue Chimneys Without Extended Flues
- These chimneys do not extend (flush
with crown or chimney top) and will require you
to use a leg
kit or bracket
that will extend down into the flue and grip or
bolt to the sides. Leg Kits are good for easy
installation and low wind areas but will not hold
up in high wind areas, for these areas you will
want to use the more secure brackets. You
will need to measure the width and length of the
opening itself. Most single flue caps will
require you to have your measurements and fit within
a range of sizes. Caps with screws on the
outside will still work well even though you are
fitting them to the inside opening of the flue itself.
You will need to measure the inside dimensions of
the flue opening (length and width). Next
you will match these measurements to the range of
sizes given by a specific chimney cap and order
the corresponding leg kit or brackets.
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3)
Multi Flue Chimneys With or Without Extended Flues
- In this application the extended flue does not
matter. With or without the flue extending
you will need to measure the total outside width
and length of the combined flues as well as how
high the highest one extends out of the chimney
where applicable. You will need to then choose
a cap that will not only cover the flue's but also
fit your chimney and clear the top of the flue's
with the lid. The screen height is very important
since you are mounting this to the chimney crown.
You want at least 5" of clearance from the top of
the flue to the top of the cap to provide a proper
draft.
An example of measuring proper screen height:
If your highest flue sticks up 3" from the chimney
crown, then your screen height needs to be at least
8". This will give you 5" of clearance between
the top of the flue and the chimney cap lid to provide
proper drafting. |
| Round Metal Chimneys |
| There are three common
types of metal chimneys,
double-wall solid-pack
insulated chimney pipe and double or
triple-wall air-insulated chimney pipe.
To determine which style you have is simple, take
a look down the pipe itself. If you are looking
at double-wall pipe there will be an inside pipe
and an outside pipe. While looking in between
the two pipes you will see either a metal cap blocking
your view, an insulation type material, or nothing
but air. If it is capped or has insulation
in it, it is solid-pack insulated chimney pipe.
If it has nothing but air it is air-insulated chimney
pipe. Triple wall pipe is almost always air-insulated. |
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Double-Wall Solid-Pack Insulated
Chimney Pipe - First measure the diameter
of the inner pipe. Next measure the diameter
of the outer pipe. The inner diameter is the
measurement used to order the cap. The outer
pipe needs to be covered to keep out rain however
it does not hurt if the outer pipe is overlapped
by the cap. As long as the outer diameter
pipe is covered rain can not get in.
Example: Inner pipe measures 6" and outer
pipe measures 8". You need a 6" cap with and
bottom ring that is larger than 8". |
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Double-Wall or Triple-Wall
Air-Insulated Chimney Pipe - First measure
the diameter of the inner pipe. Next measure
the diameter of the outer pipe. If you are
working with triple wall you can ignore the middle
pipe. The inner diameter is the measurement
used to order the cap. The outer pipe needs
to be covered to keep out rain however it does not
hurt if the outer pipe is overlapped by the cap.
As long as the outer diameter pipe is covered rain
can not get in.
Example: Inner pipe measures 6" and outer
pipe measures 12 3/8". You need a 6" cap with
and bottom ring that is larger than 12 3/8".
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