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LENNOX HEARTH PRODUCTS • MERIT
®
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Listed Secure Vent™ Components
Cat. No. Model Description
77L70 SV4.5L6 6 Inch (152 mm)
77L71 SV4.5L12 12 Inch (305 mm)
77L72 SV4.5L24 24 Inch (610 mm)
77L73 SV4.5L36 36 Inch (914 mm)
77L74 SV4.5L48 48 Inch (1219 mm)
77L75 SV4.5LA Telescopic Length Slip
Section (2" to 7-1/2" rigid)
77L76 SV4.5E45 45 Degree Elbow
77L77 SV4.5E90 90 Degree Elbow
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. Instr. #750146M)
99L03 SV4.5HRK36 Horizontal Riser Kit, 36",
(Ref. Instr. #750146M)
96K93 SV4.5SU Support Strap
H5816 SV4.5-
TWSK10
Through Wall Shield Kit
(used to shield the
direct-vent pipe from
blown insulation)
(Ref. Instr. #750247M)
The following flashings come packaged with a storm collar:
77L78 SV4.5F Flat Roof Flashing
77L79 SV4.5FA 1/12 to 7/12 Adjustable
Flashing
77L80 SV4.5FB 7/12 to 12/12 Adjustable
Flashing
77L81 SV4.5SC6 Storm Collar (6 per box)
H6183 SV4.5HF5 Firestop Spacer, 5", rigid
H6184 SF4.5HF5 Firestop Spacer, 5", flex
H2246 SV4.5HF-10 Firestop / Spacer-Horizon-
tal, rigid (3-1-1 spacing),
10 Pack
H2247 SV4.5VF-10 Firestop/Spacer-Vertical,
rigid (1-1-1 spacing),
10 Pack
96K92 SV4.5SP Support Plate
INSTALLATION ACCESSORIES
Listed Secure Vent™ Components
Cat. No. Model Description
H1968 SV4.5HT-2 Horizontal Square
Termination with
Firestop/ Spacer (H2246)
and Adaptor (74L61)
H2152 SV4.5CGV-1 Vertical Termination Cap,
High Wind
H4687 SV4.5CTS Chase Top Termination,
Square
(Ref. Instr. #750207M)
H4716 SV4.5CTS-B Chase Top Termination,
Square, Black
(Ref. Instr. #750207M)
H4717 SV4.5CTS-TC Chase Top Termination,
Square, Terra Cotta
(Ref. Instr. #750207M)
94L10* SV4.5HTSS Horizontal Small Square
Termination with
Firestop/Spacer (96K80)
and Adapter (74L61)
98L27* SV4.5HTSSL Horizontal Small Square-
Long Termination with
Firestop/Spacer (96K80)
and Adapter (74L61)
17M52 SV4.5HGS-1 Termination Guard,
Square (1 pack)
(Ref. Instr. #750109M)
17M53 SV4.5HGS-12 Termination Guard, Hori-
zontal Square (12 pack)
(Ref. Instr. #750109M)
87L02 SV4.5HGS Termination Guard for
Horizontal Square Termi-
nation (Deluxe) (1 pack)
(Ref. Instr. #750055M)
H5820 SV4.5HTSK Termination Shroud
(Guard) for Horizontal
Square Termination
(1 pack)
(Ref. Instr. #750246M)
H3907 SV4.5ARSA Attic Insulation Shield w/
adjustable height, 12"-22"
H1988 CTSA-33 Chase Top Shroud Kit,
Arch Top 3 X 3 Ft.,
(Ref. Instr. #750194M)
H1985 CTSO-33 Chase Top Shroud Kit,
Open Top 3 X 3 Ft.,
(Ref. Instr. #750193M)
H1987 CTSO-44 Chase Top Shroud Kit,
Open Top 4 X 4 Ft.,
(Ref. Instr. #750193M)
H1986 CTSO-46 Chase Top Shroud Kit,
Open Top 4 X 6 Ft.,
(Ref. Instr. #750193M)
Vent Sections
(Rigid)
S
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a
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*Only for use with MPDT/R-3328 and MPD-3530 models.