Lennox Hearth MPD-45 Series, MPD-40 Series, MPD-35 Series Fireplace Framing Specifications

FIREPLACE FRAMING SPECIFICATIONS

FRAMING WITH SQUARE HORIZONTAL TERMINATION (SV4.5HT-2)

VENT FRAMING - TOP VENT WITH ONE 90° ELBOW

Framing should be constructed

of	2x4 or larger lumber.
10-1/2	Framing Dimensions
(267)

VENT FRAMING - REAR VENT WITH NO ELBOWS

5-1/8

7

(178)

Model No.		A	B	C	D	E
MPDT-3328	in.	33 1/4	33 1/4	-----	37 3/4	12 7/8
	mm	845	845	-----	959	327

BD

C

1/2 A

A

Inches (mm)

(130)12-1/8

(308)

7

(178)

5-1/8

(130)12-1/8

(308)

E

MPDR-3328	in.	33 1/4	33 1/4	19 5/8	-----	12 7/8
	mm	845	845	498	-----	327
MPD-3530	in.	35 1/4	35 1/4	21 11/16	39 3/4	16
	mm	895	895	551	1010	406
MPD-4035	in.	40 1/4	40 1/4	26 11/16	44 3/4	16
	mm	1022	1022	678	1137	406
MPD-4540	in.	45 1/4	40 1/4	26 11/16	44 3/4	16
	mm	1149	1022	678	1137	406

8

E is the required framing depth dimension when the finish material (drywall) thickness is 1/2 in. (13mm).

Figure 9

Note-

Venting requirements for rear vent applications in corner installations -

- the horizontal vent length “a” to “b,” must not exceed 28 inches (711 mm)

MPDT-3328 AND MPDR-3328 Models -

Dimensions A to F occur when one 45 degree elbow

is connected directly to the appliance collar.

MPD-3530, MPD-4035 and MPD-4540 Models -

Dimensions D and F occur when one 45 degree

elbow is connected directly to the appliance collar.

b

F

MPD and MPDR units

7 (178)

MPD and MPDT units

Inches

(millimeters)

C

E

D

Model No.

A

B

C

D

E

F

a

MPDT-3328

in.

33 1/8

48 1/2

34 5/16

17 3/16

241/4

5

MPDR-3328

mm

841

1232

872

437

616

127

MPD-3530

in.

35 1/8

57 1/2

40 5/8

19 3/16

28 3/4

6 1/8

mm

892

1461

1032

487

730

156

A

MPD-4035

in.

40 1/8

61 3/16

43 11/32

19 3/16

30 11/16

7 7/8

mm

1019

1554

1101

487

779

200

B

MPD-4540

in.

45 1/8

66 3/8

46 15/16

19 3/16

33 3/16

9 3/4

Back wall of chase/enclosure

mm

1146

1686

1192

487

843

248

(including any finishing materials)

Figure 10

Corner Framing with Square Termination (SV4.5HT-2)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.