Figure 4.—Short chimneys are frequently provided for low bungalows, for architectural reasons. This flue is ample in size but not high enough for use with a stove. The stone masonry has been laid to harmonize with the rustic surroundings.
Frequently metal-pipe extensions are provided to increase the height of a flue on account of the low cost and ease of installation, but these must be securely anchored against wind and have the same area as the flue. Metal extensions are likely to rust in a short time. They are available with a metal cowl or top that turns with the wind to prevent air blowing down the flue. Terra-cotta chimney pots or extensions are more durable and attractive.
A chimney located entirely inside a building has better draft because the masonry retains heat longer when protected from cold outside air.
Figure 5.—Two pleasingly designed fireplace chimneys that fit into their surroundings. A, This chimney stands in the clear and should provide a good draft; B, a chimney under overhanging trees is likely to backdraft. Contrast the appearance of these two chimneys with that of [figure 3].