Drolet NG1800 Austral Owner's Manual page 20

FIGURE 2.3 (B) Minimum Slope

The assembly should be as short and direct as possible between the stove and chimney (See figure 2.4 (A)).
The use of two 45 degree elbows (See figure 2.4 (C)) is often preferable to a single 90 degree elbow (See
figure 2.4 (B)) because less turbulence is created in the exhaust flow and they result in less horizontal run.
(A) (B) (C)
FIGURE 2.4 The use of elbows
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