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Vacu Stack
Chimney Caps

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.

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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VSS Model for Round Metal & Masonry Chimneys

 For round single wall metal chimneys, masonry chimneys, chimney liners and solid pack insulated chimneys

 

VSS Model With Screen

 
Check local spark arrestor regulations for what is required in your area.

Masonry Chimney Installation:

An adapter is required for square or rectangular masonry chimneys. A patented fastening device secures the adapter to the chimney flue. Vacu-Stack caps fit inside the adapter collar. Silicone caulking must be applied to seal seams and joints.

NOTE: VSS812 & VSS1216 Include Adaptor

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VSS TDW Model for Air Cooled Chimneys

For double and triple wall air-cooled metal chimneys. Will not interfere with flow of cooling air

 

VSS TDW Model With Screen

 

Check local spark arrestor regulations for what is required in your area.


 

Easy, Quick, Secure Installation:
Fits Round, Square, or Rectangular Chimneys Problem Free Installation The Vacu-Stack Chimney Cap is easy to install. It fits directly into round flues. Square and rectangular masonry chimneys require a stainless steel adapter. The adapters are adjustable and fasten securely to the inside of the flue. Chimneys should be cleaned and inspected before installation and must conform with applicable fire, safety and building codes. Detailed instructions are furnished. The Vacu-Stack is easily removed for annual chimney cleaning and inspection.

Round Metal Chimney Installation:

Vacu-Stack caps easily fit inside round factory built chimneys. Optional stainless steel Spark Arrestors are required in some states. Check your building code..

Apply a thin film of silicone caulking (not furnished, but available from your local home center) to seal the joint between the Vacu-stack and the top of the chimney.

AIR COOLED CHIMNEYS REQUIRE TDW MODELS.... 

DO NOT bend the three spacers located on the underside of the TDW models. The spacers maintain ventilation space between the bottom of the Vacu-Stack and the top of the chimney. This is essential for uninterrupted air flow through the cooling channels in air cooled chimneys.


Accessories

 

AD  -   Stainless Steel Adaptor Plate
Used for adapting a VSS  Vacu-Stack on a square, oval, or rectangular masonry chimney flue.


Top View
Click for a bigger pic


Side View

Bottom View


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or call to order

800 685 8263
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Lower 48 States Only

SC-RS  -   Vacu-Stack Rain Shield
Easy-to-attach storm collar for VSS installations (other than air cooled TDW models)

 

 

 

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single flue chimney cap

double flue chimney cap

multi flue chimney cap

round chimney cap

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weather Shield caps

Lyemance Dampers

Exhausto Chimney Fans

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Click the links below for some tips and explanations....

CHIMNEYS 101  Understand how a chimney works, and sometimes why it won't.    


FIREWOOD     Know your wood... firewood do's and don'ts.      
       
     

Go to Downdraft & Wind Loading Explanations.

      Go to Spark Arrestor Explanations.

 

 

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