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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
Listed Secure Vent / Secure Flex™ Components
Cat. No. Model No. Description
H3907 SV4.5RSA
Attic Insulation Shield
(adjustable 12” to
22”)
H7748 FVK36
36" Flex Vent Kit
Note: Flex attaches to ap-
pliance collar at one end
and to rigid venting at the
other end.
10K81 SFMP Mill-Pac, Black, High
Temperature Sealant
89L40 SFMP-12 Mill-Pac, Black, High
Temperature Sealant -
Bulk 12 pack
91L66 SF-GC4-6 Gear Clamp 4.5 in. (114
mm) for flex (6 pieces)
91L67 SF-GC7-6 Gear Clamp 7.5 in.
(190.5 mm) for flex (6
pieces)
INSTALLATION ACCESSORIES
Listed Secure Vent™ Components
Cat. No. Model No. Description
77L70 SV4.5L6
6 inch (152mm) Vent
Section
77L71 SV4.5L12
12 inch (305mm) Vent
Section
77L72 SV4.5L24
24 inch (610mm) Vent
Section
77L73 SV4.5L36
36 inch (914mm) Vent
Section
77L74 SV4.5L48
48 inch (1219mm)
Vent Section
77L75 SV4.5LA
Telescopic Section
77L76 SV4.5E45
45 Degree Elbow
77L77 SV4.5E90
90 Degree Elbow
H2246 SV4.5HF
Firestop/Spacer -
Horizontal
(3 - 1 - 1 spacing) 10
pack
H2247 SV4.5VF
Firestop/Spacer -
Vertical
(1 - 1 - 1 spacing) 10
pack
The following flashings come packaged with a storm collar:
H5816
750,247M
SV4.5-TWSK Through Wall Shield
Kit
(used to shield the
direct-vent pipe from
blown insulation)
Ref. instr. # 750,247M
96K93 SV4.5SU
Support Strap
96K92 SV4.5SP
Support Plate