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Hearth & Home Technologies • B41L-AU Installation Manual • 2570-980 Rev. C • 7/20
WARNING! Risk of Fire!
Wire mesh required on
bottom of discharge opening (Dimension A) when
finished discharge opening is greater than 3 in. (76
mm). Secure mesh to top of framing.
ROOM CEILING
1-1/2 IN. (2 X 4 FRAMING)
2 IN. MIN.
TV
1/2 IN. X 1/2 IN.
(13 mm x 13 mm)
WIRE MESH**
CHASE CEILING REQUIRED
WITHIN 3 IN. (76 mm) OF TOP
OF OPENING
WIRE MESH**
= PASSIVE HEAT
DISCHARGE OPENING
0-3 IN.
= CHASE CEILING ZONE
(0-76 mm)
(51 mm)
(90 x 35 mm for AU)
WARNING! Risk of Fire!
Optional fan may not be
used with passive heat installation.
Figure 3.5 Passive Heat Front Discharge Framing Dimensions With and Without a Trim Kit
FRONT DISCHARGE MINIMUM FRAMING DIMENSIONS
A
B
C
D
E
TRIM KIT*
INSTALLED
(PHTRIM-LINEAR)
NO TRIM
KIT**
Required Height of
Discharge Opening
Height of
Discharge
Opening
Clearance to
Top of
Discharge
Opening
Width of
Discharge
Opening
Clearance to
Top of Discharge
Opening From
Bottom of
Appliance
Clearance from
Bottom of Appliance
to Bottom of
Discharge Opening
B41L-AU
Inches
3-1/2
2
48
36-1/2
73-7/8
71-7/8
millimeters
89
51
1219
927
1876
1826
* Measurement for Trim Kit = 3-1/2 in. (89 mm) + Additional Finishing Material Thickness. Figure 3.6 shows vent cover
dimensions.
** Measurement without Trim Kit = 2 in. (51 mm) + Additional Finishing Material Thickness. If finished discharge opening
height is greater than 3 in.(76 mm), wire mesh is required.
Framing Dimensions - Passive Heat Front Discharge (PH-FRT-LINEAR)
Front Discharge: Air conveyed into the room through one front discharge slot.
CHASE DETAIL
A
D
C
B
APPLIANCE MAY BE INSTALLED
OFF OF FLOOR
E