Heatilator LM42, Installation Manual, Page: 31 / 44

Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
31
6
Shrouds
Section 6
3 in. (76 mm) tall legs
Ø 17 1/2 in. (444.5 mm), centered round hole to fit over cap
Length x Width to fit inside shroud. Gap not
to exceed 1/2” of shroud base dimension.
*Ensure the shield
does not sag.
Figure 6.1 Radiation Shield
WARNING! Risk of Fire! Shrouds and Radiation Shields
must be constructed as specified. Improper construction
may overheat chase top.
NOTICE
: Shrouds may be field constructed where per -
mitted by regional building codes. Consult your local
building officials.
The shrouds and radiation shield must be constructed
from minimum .018 in. (26 ga) thick aluminized or stain-
less steel. Galvanized is not recommended due to cor-
rosion concerns.
A. Radiation Shield
B. Field Constructed Shrouds
The following field constructed shroud designs are ap -
proved for HHT fireplace systems and termination caps.
For shroud designs with multiple terminations contact
your authorized HHT dealer.
3 in (76 mm)
minimum
Min.
Base Dim.
Min.
Base Dim.
Min.
Top Dim.
Min.
Top Dim.
Min. Opening
Width
Min. Opening
Width
Radiation
Shield
14 1/2 in. (368 mm)
maximum height
TS345
TR344
TR342B
TR342B/TR344
with TR-TVK
Min. Base Dims.
in 23 x 23 28 x 28 26 x 26
mm 584 x 584 711 x 711 660 x 660
Radiation Shield
Required
Radiation
Shield Not
Required
Min. Top Dims.
in 20 x 20 25 x 25 23 x 23
mm 508 x 508 635 x 635 584 x 584
Min. Opening Width
in 17 x 17 22 x 22 20 x 20
mm 432 x 432 559 x 559 508 x 508
1. Open Top Shroud
TR342B/344 TV (top vent) caps do not require radiation
shield.
TR caps require radiation shield unless installed partially
above the shroud or using a TR-TVK. The TR cap must
be raised to the minimum dimensions (or greater) above
the shroud. Refer to Figure 6.3.
6" Min.
Above the
Shroud.
Storm
Collar
Shroud
Leg
(SHROUD)
(TR Series)
Flue
Shroud
Leg
3 in (76 mm)
air space from
bottom of shroud
to top of chase.
Maximum Height
14 1/2 in. (368 mm)
Chase Top
Figure 6.3 Shroud & TR Series cap with no Radiation Shield
Figure 6.2 Open Top Shroud