Round Base Chimney Vacuum Cap – Aluminum
$34.95 – $89.95
- Quality constructed from heavy-duty aluminum, .020 – .025 depending on size (see more details below)
- 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)
The FAMCO VCA 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 heavy-duty aluminum, sizes 3 inch – 4 inch are .020 aluminum, and sizes 5 inch – 12 inch are .025 aluminum. The FAMCO VCA 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 VCA 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
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Questions and answers of the customers
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Joseph (verified owner) –
It is improving the draft of the chimney. The fire is much easier to start even on very gusty days. The season is almost over so I it hasn’t had a lot of testing, but so far – great. If you are thinking of buying you must get on the roof and measure the outer diameter of the chimney. That is what you base your choice on. Those triple wall pipes that come through the roof can vary in outer diameter by at least an inch. That will affect which chimney cap you purchase. I got “surprised” but now you don’t have to!
Gary Hicks (verified owner) –
Perfect with no problems
Paul (verified owner) –
Chris B. (verified owner) –