Operating instructions

Maximum vertical height of system should not exceed 40 feet [12.2m].
Use roof support and 7" rigid pipe at roof level. Flex not permitted within roof support.
When penetrating the roof a rigid 7" galvanized pipe must be used. Attach the 7" flex to the 7" rigid
with high temperature sealant, secure with four screws assuring the flex and rigid pipe are
secured. 4" flex pipe must be secured the same way with 4 screws but must penetrate the 4" flex
and 4" section of termination. Attach 7" rigid pipe to 7" termination with sealant and screw with 4
sheet metal screws (see Figure 28c).
Vertical termination clearance is 18" [45.7cm] above the roof, measured from highest point of exit
on the roof line.
Support vertical pipes to maintain minimum of one inch or greater clearances to combustibles
Figure 27 - Clearances in horizontal venting.
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