36
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Flex
LENNOX HEARTH PRODUCTS • MERIT
®
SERIES DIRECT-VENT GAS FIREPLACES • MODELS MLDVT-30/35/40/45 • INSTALLATION INSTRUCTIONS
Cat. #
Model
Description
H1969
SF4.5HT-2
Horizontal Square Termina-
tion for flex
(without flex)
77L87
SFKIT12S
Square Term. for flex
(with 12 inch [305 mm]*
compressed flex)
77L88
SFKIT18S
Square Term. for flex
(with 18 inch [457 mm]*
compressed flex)
77L89
SFKIT24S
Square Term. for flex
(with 24 inch [610 mm]*
compressed flex)
77L90
SFKIT36S
Square Term. for flex
(with 36 inch [914 mm]*
compressed flex)
77L91
SFKIT48S
Square Term. for flex
(with 48 inch [1219
mm]* compressed flex)
94L04
SFKIT12SS
Small Square Termination
for flex,
with 12 in. (305
mm) of *compressed flex
vent
(ref. Instr. P/N 750204M)
94L05
SFKIT18SS
Small Square Termination
for flex,
with 18 in. (457
mm) of *compressed flex
vent
(ref. Instr. P/N 750204M)
94L06
SFKIT24SS
Small Square Termination
for flex,
with 24 in. (610
mm) of *compressed flex
vent
(ref. Instr. P/N 750204M)
94L07
SFKIT36SS
Small Square Termination
for flex,
with 36 in. (914
mm) of *compressed flex
vent
(ref. Instr. P/N 750204M)
94L08
SFKIT48SS
Small Square Termination
for flex,
with 48 in. (1219
mm) of *compressed flex
vent
(ref. Instr. P/N 750204M)
94L09
SF-HTSS
Horizontal Small Square
Termination for flex, without
flex vent
(ref. Instr. P/N 750204M)
56L74
SFVT30
Vertical Termination for
flex
(flat to 6/12) with flex
adaptor, section of rigid
vent, roof support collar
assembly, roof flashing
and storm collar.
(ref. Instruction P/N 750052M)
56L75
SFVT45
Vertical Termination for
flex
(6/12 to 12/12) with
flex adaptor, section of
rigid vent, roof support
collar assembly, roof
flashing and storm collar.
(ref. Instruction P/N 750052M)
91L66
SFGC4-6
Gear Clamp 4.5 in. (114
mm) for
flex
(6-pack)
91L67
SFGC7-6
Gear Clamp 7.5 in. (190.5
mm) for
flex
(6-pack)
H7748
FVK36
36"
Flex Connector Kit
Note: Flex attaches to
appliance collar at one end
and to rigid venting at other
end.
Listed Secure Vent™ Components
Cat. #
Model
Description
17M52
SV4.5HGS-1
Termination Guard, Square
(1-pack)
(ref. Instruction P/N 750109M)
17M53
SV4.5HGS-12
Termination Guard, Hori-
zontal Square (12-pack)
(ref. Instruction P/N 750109M)
87L02
SV4.5HGS
Termination Guard for
Horizontal Square Termi-
nation (Deluxe) (1-pack)
(ref. Instruction P/N 750055M)
H5820
SV4.5HTSK
Termination Shroud
(Guard) for Horizontal
Square Termination
(1-pack)
(ref. Instruction P/N 750246M)
H5816
750,247M
SV4.5-
TWSK10
Through Wall Shield Kit
(used to shield the direct-
vent pipe from blown
insulation)
(ref. Instruction P/N 750247M)
H3907
SV4.5ARSA
Attic Insulation Shield w/
adjustable height, 12"-22"
96K93
SV4.5SU
Support Strap
10K81
SFMP
Mill-Pac, Black, High
Temperature Sealant
89L40
SFMP-12
Mill-Pac, Black, High
Temperature Sealant -
Bulk 12-pack
99L02
SV4.5HRK14 Horizontal Riser Kit, 14"
(ref. Instruction P/N 750146M)
99L03
SV4.5HRK36 Horizontal Riser Kit, 36"
(ref. Instruction P/N 750146M)
H1988
CTSA-33
Chase Top Shroud Kit, Arch
Top 3 X 3 Ft.
(ref. Instruction P/N 750194M)
H1985
CTSO-33
Chase Top Shroud Kit,
Open Top 3 x 3 ft.
(ref. Instruction P/N 750193M)
H1987
CTSO-44
Chase Top Shroud Kit,
Open Top 4 x 4 ft.
(ref. Instruction P/N 750193M)
H1986
CTSO-46
Chase Top Shroud Kit,
Open Top 4 x 6 ft.
(ref. Instruction P/N 750193M)
Listed Secure Flex™ Components
These termination kits include firestop/spacer, gear clamps and flex adaptor.
60L10
SF-18
18 feet (5.49 m) *
compressed flex
(ref. Instruction P/N 750053M)
98K03
SF-12
12 feet (3.66 m) *
compressed flex
(ref. Instruction P/N 750052M)
H2248
SF4.5HF-10
Firestop/Spacer-Horizontal,
flex
(3-1-1 spacing)
,
10-Pack
H2249
SF4.5VF-10
Firestop/Spacer-Vertical,
flex
(1-1-1 spacing)
,
10-Pack
INSTALLATION ACCESSORIES CONTINUED
*
All compressed flex vents can be expanded up to two times.
Seala
nt
(Fits H1968)
(Fits 94L10
& H1968)
(Fits 94L10
& H1968)
