StormShield Model STS-TDW
for air cooled double and triple wall flue pipe

Above are options to fit the most common air cooled flue pipe sizes.
  Please call us to order any other size.

Sizing for an air cooled StormShield

Air cooled flue pipe needs to be measured by its INSIDE measurement.

Typically... an air cooled flue system will consist of an inner and outer pipe(s) with an air space between them.  Some systems may have braces, wire, tabs or smaller openings between the layer(s) of pipe.  The distinguishing factor for this system is that the spacing channels from the top where the chimney cap would go all the way to the start of the flue system.

Note: All layers of pipe need to be at the same level for proper installation.  Most pipe can be trimmed or extended to accomplish this.

Air cooled double and triple wall flue systems need an air cooled chimney cap.

The inner pipe of an air cooled system is for smoke and flue gases.
... the larger surrounding outer pipe(s) will vary in size depending on the air space between the pipes and manufacturers design.
This air space needs to be vented to insure the flue systems proper function.
An air cooled pipe system uses the air space as an insulation value.  The more spacing between the pipes, the less heat to the outer pipe(s), and the closer one can build to the system.