Round Base Chimney Vacuum Cap – Stainless Steel

(10 customer reviews)

$39.50$135.40

  • Quality constructed from heavy-duty 26 gauge stainless steel
  • Increases updraft and prevents downdrafts caused from wind by forcing the wind to alter its direction over one of four gores on the cap, creating a partial vacuum
  • Designed to be mounted over single wall pipe and comes with a draw bolt collar for a secure fit
  • Positioning of the cap relative to the prevailing winds is not critical, but is slightly more effective when placed with the flat side facing the winds.
  • Available for single wall pipe sizes ranging from 3 inch to 12 inch outside diameter (not designed for double/triple wall pipe sizes)
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The FAMCO VCSS round base vacuum chimney cap has been used for decades with gas, oil, coal, and wood burning chimneys. This chimney cap increases updraft and prevents downdrafts caused from wind. This works by forcing the wind to alter its direction over one of four gores on the cap. The change of direction creates an area of lower density air (partial vacuum) at the outlet of the pipe. Lower density air creates draft within the exhaust pipe, helping to remove exhaust gases and increasing overall efficiency. The positioning of the cap relative to the prevailing winds is not critical but is slightly more effective when placed with the flat side facing the winds. Quality constructed in 26 gauge stainless steel.

The FAMCO VCSS chimney cap has a round base and draw bolt for secure installation. The adjustable collar will only provide approximately ⅛ inch of play for tightening to the appropriate pipe size, and is not designed to expand to accommodate different pipe sizes or double/triple wall pipe sizes (NOT designed to fit X&⅛”, X&¼”, X&½”, etc.). Comes for pipe sizes ranging from 3 inch to 12 inch OD and heights ranging from 4¾ inch to 15 inch, see our specs sheet for more details. The FAMCO VCSS chimney cap is manufactured by FAMCO in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this product, please refer to the FAQs above or feel free to contact us.

Download the Product Specs .PDF

Watch the product video on YouTube.

Download the Product Specs .PDF

Round Base Chimney Vacuum Cap - Stainless Steel

SKU: VCSS

10 reviews for Round Base Chimney Vacuum Cap – Stainless Steel

5 star
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  1. tomas v. (verified owner)

    Fantastic cap for our Dickinson diesel heater on our Gulfstar 50 ketch (that’s a sailboat)! We had problems with negative pressure from the breeze spilling over our dodger and down into the flue (with the Dickinson H-Cap installed); since we installed the FAMCO Vacuum Cap (and having similar conditions to test it) the problem seems to be solved. Thank you, FAMCO! Smooth sailing, Tom & Shauna, sv SPIRIT

  2. Allan (verified owner)

    Easy to install the adjustment feature was great. Very effective even in low breeze

  3. John K. (verified owner)

    Ordered this cap for a vacation home in the Cascade mountains that gets around 400″ of snow fall each year — often over 10′ on the ground. The previous cap supplied by the local installer was flat on top and couldn’t bear the weight of a couple feet of snow. Very pleased with the build quality and quick ship on this chimney cap. With a barrel rounded top and sloped sides, I’m looking forward to many years of reliable protection and cozy warm heat during the winter.

  4. Mark

    I am on a fixed income and need to keep my electric bill down. Your chimney vacuum cap was the best priced online and now I can burn wood without smoke being blown back into my house. This is allowing me to burn wood from my property and not use electric to heat! Thank you……

  5. STEVEN GARCIA (verified owner)

    Ups lost it ,two days later it was delivered

  6. Michael Gobber (verified owner)

  7. Joseph (verified owner)

    Excellent cap for wind, rain and snow! This cap was exactly what I was looking for. It works so well I am going to get another one just to have one on hand for a spare. Great cap!

  8. Joseph D. (verified owner)

    This cap is incredible! It will keep the rain out, and works very very well on a windy day! I have to say that I am impressed! I liked is much, the way it works, that I bought another one! Always good to have an extra on hand! Thanks for a great product.

  9. Anonymous (verified owner)

    Does the job, lets me use the stove in high winds

  10. Sandra S. (verified owner)

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Questions and answers of the customers

  1. Q Can a spark arrest screen be installed ?
    Asked on November 15, 2020 5:38 pm
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