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Chimney Caps / VacuStack - TDW Please choose one of products below...
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Vacu Stack Chimney Cap
Wind Resistant / Anti Downdraft Cap
for double and triple wall air cooled flue pipe
Above are
options to fit the 3 most common metal flue pipes. Please call us
to order any other size.
Combo priced options include and ship with...
VacuStack for air cooled flue system and factory installed 1/2" spark arrestor mesh. |
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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. |
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
Air cooled double and triple
wall flue systems need to be measured by their INSIDE
measurement.
Typically... the inner pipe will be a "full" inch
measurement...
IE... 8" not 7 3/4" or 10" not 10 1/4"
... the larger outer pipe will vary in size depending on the air space
between the pipes and manufacturers design..
The inner and outer pipe need to be the same height
for proper installation of a VacuStack.
Need extra help? Measure and
e-mail us a picture....
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If the inner pipe is higher
the outer pipe you will need to cut the pipe to the same height as the
outer.
Note: look for any "extension" of pipe that can be removed to avoid
cutting.
If the inner pipe is lower than the outer... a small section of pipe may
need to be installed. |
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VacuStack |
MEASUREMENTSS |
A |
B |
C |
VSS6-TDW-S5 |
6 |
16 |
14 |
VSS8-TDW-S5 |
8 |
16 |
18 |
VSS10-TDW-S5 |
10 |
16 |
21 |
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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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