The chimney shown at right is a classic example of a problem chimney which is too short. How short? Consider that a stove located on the single floor of this ranch house enters the chimney at about the height of the window air conditioner that you can see next to the chimney. The total height of the chimney from that point to the termination is less than 8 feet. In addition, the chimney is built at the low side of the roof and does not meet the standard of "two feet higher than anything within 10 feet".

An Extend-a-Flue™ would certainly help a chimney like this by adding over 30% to it's height. It would also bring the chimney up to the height required by code. However, this chimney may need even more help than that.

Experts Opinion: This chimney should be built at least two feet higher with masonry and then be fitted with an Extend-A-Flue for a total height of 13+ feet.

This chimney also has the two problems described above - it is too short and it is too close to the taller part of the home. Wind induced downdrafts are almost surely a problem for this flue.

Experts Opinion: This chimney may have a reasonable height, but is too close to the other roofline. Adding an Extend-A-Flue would increase height and help it clear the other roof line.