Drolet HT-1600 Owner's Manual page 23

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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