Square Flue Vacuum Cap – Galvanized

(4 customer reviews)


Category: Chimney Cap – Subcategory: Square Base Material: Galvanized Steel – Finish: Mill – Thickness: 28 Gauge Shape: Square – Dimensions: 8×8”, 8×12”, 8×16”, 12×12”, 12×16” – Sku: SQ


Exact length * 

exact outer length of your flue

Exact width * 

exact outer width of your flue

Perimeter in inches

exact outer perimeter of your flue

The FAMCO SQ Square Flue Vacuum 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 its flat side facing the winds. Quality constructed in 28 gauge Galvanized steel. The FAMCO SQ Square Flue Vacuum Cap has a rounded corner square base and draw bolt for secure installation. Comes in a range of sizes; 8×8 inch, 8×12 inch, 8×16 inch, 12×12 inch, and 12×16 inch. Measure carefully. This is a custom item requiring your exact length, width and perimeter measurements for the outside dimension of your flue. FAMCO can custom build certain sizes of the Square Base Chimney Caps. The FAMCO SQ Square Flue Vacuum 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 by phone or email.


Square Flue Vacuum Cap - Galvanized


4 reviews for Square Flue Vacuum Cap – Galvanized

5 star
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1 star
  1. Floyd M. (verified owner)

    A good product that’s needed in my use case. (I may upgrade to stainless soon.) Famco is a manufacturer that direct ships their own products, but don’t let that intimidate you – they have excellent customer service. You can order with confidence.

  2. Rob H. (verified owner)

    Great Experience! Thank you Famco

  3. Terry Holland (verified owner)

    I haven’t installed it yet but I’m sure it will fit and do the job it was purchased for which was to keep wind from blowing down the flu. Looks very well made, very pleased.

  4. John G. (verified owner)

    Great product would be even better with a rodent screen

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