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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 Flex™ Components
Cat. # Model Description
H1969 SF4.5HT-2 Horizontal Square Termina-
tion for flex (without flex
vent)
77L87 SFKIT12S Square Term. for flex
(with 12 inch [305 mm]
compressed flex vent**)
77L88 SFKIT18S Square Term. for flex
(with 18 inch [457 mm]
compressed flex vent**)
77L89 SFKIT24S Square Term. for flex
(with 24 inch [610 mm]
compressed flex vent**)
77L90 SFKIT36S Square Term. for flex
(with 36 inch [914 mm]
compressed flex vent**)
77L91 SFKIT48S Square Term. for flex
(with 48 inch [1219 mm]
compressed flex vent**)
94L04* SFKIT12SS Small Square Termination for
flex, with 12 in. (305 mm) of
compressed flex vent**
(Ref. Instr. #750204M)
94L05* SFKIT18SS Small Square Termination for
flex, with 18 in. (457 mm) of
compressed flex vent**
(Ref. Instr. #750204M)
94L06* SFKIT24SS Small Square Termination for
flex, with 24 in. (610 mm) of
compressed flex vent**
(Ref. Instr. #750204M)
94L07* SFKIT36SS Small Square Termination for
flex, with 36 in. (914 mm) of
compressed flex vent**
(Ref. Instr. #750204M)
94L08* SFKIT48SS Small Square Termination for
flex, with 48 in. (1219 mm)
of compressed flex vent**
(Ref. Instr. #750204M)
94L09* SF-HTSS Horizontal Small Square
Termination for flex, without
flex vent (Ref. Instr. #750204M)
INSTALLATION ACCESSORIES CONTINUED
*Only for use with MPDT/R-3328 and MPD-3530 models.
**All compressed flex vents can be expanded up to two times.
Listed Secure Flex™ Components
Cat. # Model Description
These termination kits include firestop/spacer, gear clamps and flex adaptor.
60L10 SF-18 18 feet (5.49 m) *
compressed flex
(Ref. Instr. #750053M)
98K03 SF-12 12 feet (3.66 m)*
compressed flex
(Ref. Instr. #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 Pk
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. Instr. #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. Instr. #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 H7748 36" Flex Connector
Kit. 36" of flex with two
adapters for mating two
rigid sections of vent
together.