
43
Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
G. Shrouds
• Chase top shrouds may be field constructed where
permitted by regional building codes.
WARNING! Risk of Fire!
Shrouds must be constructed
as specified. Improper construction may overheat chase
top.
NOTICE:
Some regional codes require an agency-
Listed shroud. Consult your local building officials.
• The following field constructed shroud designs have
been tested for Hearth Technologies fireplace 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.
HHT Shrouds
• You may install a shroud with this fireplace. See
Section 12.B 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 7.16 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
Min. Base Dim
Min. Height
Min.
Base Dim
Figure 7.17 Mailbox Style Shroud Dimensions
Minimum
Opening
Height
Minimum
Base Dimension
Min. Opening
Width
Min. Base Dimension
Minimum
Height
Figure 7.18 Roofed Style Shroud Dimensions
Roofed Style Shroud (may be used with DVP-TV,
DVP-TVHW, SLP-TVHW)
Mailbox Style Shroud (may be used with DVP-TV,
DVP-TVHW, SLP-TVHW)
Min. Base Dims.
in
20 x 20
mm
508 x 508
Min. Height
in
18
mm
457
Min. Base Dims.
in
20 x 20
mm
508 x 508
Min. Height
in
18
mm
458
Min. Opening Width
in
14
mm
356
Min. Opening Height
in
10
mm
254