Draft; Typical Types Of Chimney Systems - Osburn 1800 Owner's Manual

1.5.3.4 Draft

Your Osburn stove will attain its best performance if installed with a chimney system that has proper
draft. (Draft is the force that moves air from the appliance up through the chimney and is
predominantly affected by the height and diameter of the chimney, and the stack temperatures of the
stove). If you test the draft using a pressure gauge, the reading should be between .05 - .07 inches of
water column (w.c.) at a medium high fire. (See Table 2.2). Drafts of less than .03" w.c. will cause
operation difficulty while too much draft (greater than .10" w.c.) will result in over-firing of the stove.
This can result in excessive operating temperatures. If this is the case, a manual damper may be
installed in the vertical connector pipe to help reduce excessive draft.
Figure 1.4 Connection to a Masonry Chimney (Exterior Shown)

1.5.4 Typical Types of Chimney Systems

There are basically two types of chimney systems; one employs an existing masonry chimney,
while the other employs a manufactured or factory built chimney. In either system the chimney
may be of an interior or an exterior type. The following illustrations are provided to
demonstrate the basic components required for a proper and safe installation. The components
identified may not appear exactly as those purchased – the manufacturers' installation
instructions and specified clearance distances should always be followed in accordance with
local and national installation codes. In Canada the CSA B365 and the CSA C22.1 installation
codes are to be followed. In the USA the ANSI NFPA 70 and ANSI NFPA 211 installation
codes are to be followed.
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