17
3.3.4.2 Use of Sealant
Sealant is required on vent system joints. On longer vent runs, especially vertical runs, sealant will
ensure that the combustion air enters from outdoors, and not through the vent joints. Use Mil-Pac
Black sealant (or equivalent), available from local suppliers or Osburn dealers, on the inner pipe joint,
applying the sealant around the outside of the male part of the vent. A bead of silicone should be
used on the outside of the joint after assembly to seal the supply air.
Apply RTV high temperature sealant around male pipe
.
Figure 9
3.3.4.3Vent Restrictor Installation
Figure 10
Vent Restrictor
When required installed the vent restrictor inside the 4” vent adaptor collar of the unit. Bend the tabs
down and slide the restrictor down inside the collar (see diagram). You will notice a rolled bead at this
point in which the restrictor will rest.
4” Collar attached
to unit
