Monessen Hearth M400BFC manual Side Wall Protection, Hearth Installation, Minimum Wall Clearances

M400BFC Balanced Flue Heat-Circulating Fireplace

Side Wall Protection

Hearth Installation

Adjacent combustible side walls that are within mini- mum dimensions shown in Figure 24 of the fireplace opening must be protected with MHSC Wall Shield Model SP40 or a specifically built wall shield described in Figure 18.

The special wall shield design described in Figure 18 is an alternate method of adding protection to side walls and can be used in place of the SP40 with the same wall clearances specified for the SP40. Rt must =1.85 minimum.

Examples of wall shield insulation:

1.Manville - CERAFORM 126, K=.27, 1/2 inches thick

2.EH2416, K = .458,

1 inch thick required.

A hearth extension is required to protect a combustible floor in front of the fireplace. Refer to Figure 21 for mini- mum dimensions and mounting detail.

Note: Hearth Extension must not cover the air inlet opening of a fireplace.

The hearth extension described in Figure 21 must be a durable non-combustible material with a minimum (total) Rt value of 1.09; refer to Figure 22 for examples. The overall height (above a combustible floor), depth and width must be as indicated, with the extension cen- tered to the fireplace opening.

The top of insulation must be covered with a non-com- bustible decorative covering or a piece of .018” mini- mum sheet metal, to protect hearth extension material. (Fig. 21)

Secure the hearth extension to the floor to prevent shifting, using trim molding or other similar means at three (3) outer edges. Seal crack between the fireplace hearth and hearth extension with a non-combustible

material. (Figs. 21 and 23)

Minimum Wall Clearances

Minimum Hearth Extension Dimensions

WITH

WITHOUT

(for On-Site Construction)

Noncombustible

Noncombustible

Surround Facing

Surround Facing

Shaded area

4" Brick

starts 1/2" from

G

G

H

(Example material)

away from edge

of unit

4"

Firebox

J

E F**

E D

Seal cracks

Opening

May install

between the

C**

A - Min. clearance

noncombustible

fireplace

to combustible

decorative

and hearth

perpendicular wall

covering

extension with

Side

B - Min. clearance

Side

OR .018" min.

noncombustible

Wall

to combustible

Wall

sheet metal

material

Fireplace

perpendicular wall when

Hearth

using noncombustible wall shield*

Combustible material permitted within shaded area.

4" MIN.

* Noncombustible wall shield requires 1" EH2416

insulation (minimum R Value = 1.85) between decorative

Combustible

Minimum

Safety strips

noncombustible rigid covering and combustible wall.

Minimum height and width is 40" x 40".

Floor

Insulation

must overlap

** Dimension/degree of angle will vary depending on thickness

Value "R"

56O" minimum

of noncombustible surround facing.

A

B

C

D

E

F

G

H

J

M400BFC

26”

12”

17°

25°

12”

8”

8”

18”

47¹⁄₄”

FP594b

660 mm

305 mm

305 mm

203 mm

203 mm

457 mm

1200 mm

Fig. 21 Combustible side wall protection and hearth extension dimensions.

16 87D1505