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FIGURE 6-3 — DOUBLE THIMBLE - ROOF OUTLET DETAILS
a rain shield must be included above the thimble as shown in Figure 6-3. The rain cap as shown
on the end of the exhaust pipe is recommended only in areas not subject to freezing
temperatures. In an area where freezing is common, extend the exhaust piping well beyond the
roof and use a gradual “U” bend at the end to direct the exhaust outlet downward which will keep
rain, snow, etc., out of the pipe. Some other important points relating to exhaust outlets are as
follows:
x Keep exhaust outlet well away from windows, doors, passageways, air intake vents or areas where gases
could accumulate.
x Keep exhaust piping well away from fuel lines, fuel tank filler caps and combustible materials.