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:
ξ Keep exhaust outlet well away from windows, doors, passageways, air intake vents or areas where gases could accumulate.
ξ Keep exhaust piping well away from fuel lines, fuel tank filler caps and combustible materials.
