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Chimney Caps / VacuStack - RS
Please choose one of products below...
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Vacu Stack Chimney Cap
Wind Resistant / Anti Downdraft Cap
for single wall, chimney liners & Class-A
insulated flue pipe
Above are
options to fit the 2 most common metal flue pipes.
Please call us
to order any other size.
Combo priced options include and ship with...
VacuStack, factory installed Rain Shield and 1/2" Spark Arrestor Mesh. |
Factory Installed
RS - Rain Shield
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The Vacu-Stack Chimney Cap solves the two wind related
chimney problems -- wind induced downdraft and dynamic wind loading. The
streamline flow of the wind around the Vacu-Stack prevents wind from
blowing into the chimney -- even when the wind is deflected downward.
The Vacu-Stack creates a venturi that causes flue gases to flow up and
out of the chimney. |
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There are no moving parts to bind or
malfunction.
Vacu-Stacks are tested by an independent testing laboratory. In the
absence of wind, Vacu-Stacks provide a more than adequate passage for
exhausting flue gases. The open spaces in a properly sized vacu-stack
are several times larger than the flue opening. The unique design of the
Vacu-Stack gives excellent protection from downdrafts caused by wind,
where other devices often fail. |
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 High
quality austenitic stainless steel, T-304, guarantees superior
durability for long service life. All fasteners and hardware are also
made of stainless steel for complete corrosion protection. Ribbed
construction provides extra strength and reinforcement. Exposed edges
are hemmed for ease of installation. The Vacu-Stack chimney cap is made
in the USA.
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Sizing for a VacuStack
Single wall, liners and Class A insulated flue pipe need to be measured by its INSIDE
measurement.
Typically... newer standard size insulated flue pipe
will have a 1" thick wall.
Older insulated flue pipes will vary
in their outer measurements.
Measure and give us a call if
you would like help sizing for a Vacu Stack. |
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Insulated Class A Flue Pipe
w/ locking system |
VSS-RS-S5 VacuStack
Installs to INNER pipe measurement |
Factory installed Rain Shield
fully covers top of flue pipe |
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| Factory installed Rain Shield fully
covers past outer flue pipe to help protect against any water leakage
between pipe and VacuStack. |
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VacuStack |
MEASUREMENTS |
| A |
B |
| VSS6-RS-S5 |
6 |
14 |
| VSS8-RS-S5 |
8 |
18 |
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Downdrafts & Wind Loading
Dynamic wind loading may occur in buildings when
the wind causes negative air pressure. Negative air pressure and
consequent tell-tale backpuffing may be particularly noticeable when a
door or window is opened on a side of the building other than the
windward side. To restore normal pressure in the building, make up air
is apt to enter via the chimney and down into the living area. If the
appliance is operating, smoke is then carried into the room.
This can be remedied by cracking open a window on the
windward side of the house and closing windows on the other sides. The
windward side is the side the wind strikes. A Vacu-Stack is recommended
as a partial solution to this problem as well. |
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Wind Loading on a multi-story building is
another common cause of smoke and backpuffing. As the wind flows against
the second story vertical wall, a high pressure zone develops at the
chimney top. Although a Vacu-Stack is not guaranteed as solution to this
problem, field reports show satisfactory results in more than 50 percent
of the installations.
The occurrence of smoke and backpuffing when air is calm may be
caused by a number of structural factors that relate to the heating
system. The chimney may be too short or the flue opening may be too
large or small for the heating appliances. Smoke may also occur if the
chimney is blocked with soot, creosote or debris.
In a relatively air-tight house, negative pressure problems can be
caused by appliances that exhaust the inside air, such as cooking
ranges, exhaust fans, a clothes dryer vent, furnaces or other devices.
Your individual chimney problem may be the result of a variety of
factors.
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| Back To: |
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Vacu Stack
w/ Rain Shield & 1/2" Screen
(for single wall & insulated
pipe) |
Vacu Stack
w/ 1/2" Screen
(for air cooled metal pipe) |
Vacu Stack
w/ Adaptor & 1/2" Screen
(for brick & clay liners) |
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