Lennox Hearth VIS35 - Manual (Page 14)

14 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
f
lue
r
estriCtors
This stove uses balanced flue technology to ensure proper
combustion. As such, flue restrictors may need to be in-
stalled depending on the vent configuration of your stove.
The drawings on page 15 show all the allowable pipe con-
figurations for the Vintage™ gas stove. To properly install
the flue restrictor, first find your pipe configuration in the
drawings on page 15 and note which restrictor setting is
recommended. The flue restrictor is shipped in the firebox
of your stove. To install the restrictor, lift up and remove
the cast iron grille at the inside top of the firebox. Above the
grille is the flue opening (see Figure 24). Remove the two
5/32” allen head screws (see A in Figures 24 & 25). Install
the restrictor by putting the screws A into the holes 1, 2,
3, or 4 corresponding to the restrictor position numbers
found on the drawings for your pipe configuration. Then
reinstall the screws in their original holes in the top of the
firebox. Lastly, reinstall the cast iron grille in the top of the
firebox. Restrictor positions are based on tests run in a
laboratory. The optimum restrictor positions may need to be
adjusted slightly depending on the conditions surrounding
the residential installation. Do not adjust (close) restrictors
to a point where the stove is sooting.
A
Flue Opening in the
top of the firebox
A
Restrictor
Restrictor Installed
Over Flue Opening
Figure 
Figure 5
Figure 4