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Heatilator • NNXT4236IF, NNXT4236ILF, NNXT3633IF, NNXT3633ILF Installation Manual • 4055-980 Rev. D • 9/15
• Chase top shrouds may be
fi
eld constructed where permitted by regional building codes.
WARNING! Risk of Fire!
Shrouds must be constructed as
speci
fi
ed. Improper construction may overheat chase top.
NOTICE:
Some regional codes require an agency-Listed
shroud. Consult your local building of
fi
cials.
• The
following
fi
eld constructed shroud designs have been tested for Hearth Technologies
fi
replace systems and termination
caps.
• The shrouds must be constructed from a minimum .018 in. (26 ga) thick aluminized steel.
• The wire mesh is optional but recommended and must be .018 in. thick minimum, 1/2 in. mesh.
G. HHT Shrouds
• You may install a HHT shroud with this
fi
replace. See Section 12.A for a list of UL Listed shrouds. Follow the instructions
included with these optional components
Min.
Base Dim.
Min.
Base Dim.
Min.
Top Dim.
Min.
Top Dim.
Figure 7.17 Open Top Shroud Dimensions
Field Constructed Shrouds
Open Top Shroud (may be used with DVP-TV, DVP-TVHW, SLP-TVHW)
Min. Base Dims.
in
19 x 19
mm
483 x 483
Min. Top Dims.
in
16 x 16
mm
406 x 406
