DuraVent FasNSeal Single-Wall - Manual (Page 19)

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entire system to ensure all joints are secured
and sealed correctly. The seams and joints
must be checked for gas tightness when
using the venting system with Category
III or IV appliances and for free movement
of flap. M&G DuraVent recommends that a
qualified inspector check the entire system
at least once annually following the initial
installation.
The installation must conform to the
requirements of the appliance manufacturer’s
instructions, the National Fuel Gas Code, and
local codes and regulations.