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87D0176

17

B36LA8 & B36RA8 Woodburning Fireplaces

PLANNING INFORMATION

Preplanning an installation is very important to ensure 
safety and to save time and money. An installer must 
predetermine where a fireplace will be set and how the 
chimney system will be run.

NOTE:

 The B36RA8 and B36LA8 models use MHSC 

SK8 (2-wall) chimney systems. 

MOUNTING THE FIREPLACE

A fireplace may only be mounted on the following sur-
faces:
1. A flat combustible surface.
2. A raised wooden platform.
3. A concrete block or other solid object placed beneath 

each of the four (4) corners of the fireplace.

The fireplace 

must

 be spaced 1/2" (13 mm) from a com-

bustible back wall and 1/2" (13 mm) from a combustible 
side wall or support. (Page 14, Fig. 20)

PLANNING THE CHIMNEY RUN

Determine how the chimney will be run, length of run 
and chimney components required to complete the job. 
(Fig. 6)  

Never

 install a chimney below minimum heights.

Figure 6 - 

Installed lengths of chimney sections

FP705

L1

L1

LT

MODEL SK &

2 WALL CHIMNEY

TOTAL

LENGTH

(LT)

INSTALLED

LENGTH

(L1)

SK81
SK818
SK83
SK84

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

FP705

STR/CVR-CHIM SECT. INSTALLED LENGTH

5/28/98

AC246

Figure 7 - 
Ten Foot Rule illustration

2' Min.

2' Min.

3'

Min.

0 To 10'

3'

Min.

0 To 10'

AC246

4/1/96

Reference

Point

In planning a chimney system, it is important to know:
1.  The height of a chimney is measured from the hearth 

to the exit point on the termination.

2.  A chimney cannot be offset more than 30° from a 

vertical plane.

3.  A chimney may run straight up or it may be necessary 

to offset it to avoid obstructions.

4.  The maximum length of an angled run (total chimney 

system) is 20' (6 m).  

5.  No more than 2 offsets (4 total 30° elbows in U.S./or 

2 total 45° elbows in Canada) per fireplace may be 
used.

6.  A guy wire stabilizer is required for chimneys extend-

ing more than 6' (1.8 m) above a roof line.

THE TEN FOOT RULE

Major U.S. building codes specify a minimum chimney 
height above the roof top. The “Ten Foot Rule” is a fire 
safety rule and not a draft rule.  To ensure proper draft, 
it is recommended that you always meet or exceed the 
“Ten Foot Rule,” especially when installing a termination 
on a high pitch roof.  (Fig. 7)
The key points of the "Ten Foot Rule" are:
1. If the horizontal distance from the chimney to the peak 

of the roof is 10' (3 m) or less, the top of the chimney 
must be at least 2' (610 mm) above the peak of the 
roof, but never less than 3' (914 mm) in height above 
the highest point where it passes through the roof.

2. If a horizontal distance from the chimney to the peak 

of the roof is more than 10' (3 m), a chimney height 
reference point is established on the surface of the 
roof a distance of 10' (3 m) from the chimney in a hori-
zontal plane.  The top of the chimney must be at least 
2' (610 mm) above the reference point, but never less 
than 3' (914 mm) in height above the highest point 
where it passes through the roof.

CHIMNEY SUPPORTS

The chimney system is supported by the fireplace for 
vertical chimney heights less than 20' (6 m) above the 
hearth. Chimney supports are required if the vertical 
height exceeds 20' (6 m). Locate chimney supports 
at ceiling holes or other structural framing at 20' (6 m) 
heights. Spacing between chimney supports 

must not

 

exceed 20' (6 m). Use Chimney Support Model SKCS8 
for SK8 chimney.  

(NOTE: the chimney support can 

not be mounted directly to the fireplace.) 

 Support 

provided by elbow straps fulfills the support requirement 
only if they are spaced as previously described. (A chim-
ney support is 2

Z\x

" (64 mm) long when installed.)

Angled chimney runs require a support every 6' (1.8 m) 
in addition to the elbow straps. Chimney supports are 
used for this function. (Fig. 9) 

Содержание B36LA8

Страница 1: ...r Residential Installation 36 Built in Wood Burning Corner Fireplace with Optional Outside Air and Glass Doors WARNING This fireplace has not been tested with an unvented gas log set To reduce risk of...

Страница 2: ...installation you should check with local building officials to obtain required permits and assure compliance with local regulations and coded If you encounter problems with code requirements contact...

Страница 3: ...ed for supplemental heating only and is not intended for use as a primary heating system The fireplace is designed to sit directly on a combustible floor The fireplace must be installed with clearance...

Страница 4: ...the precautions and recommendations in the section of this manual pertaining to outside combustion air assembly The fireplace is also equipped with a flue damper which must be open when the fireplace...

Страница 5: ...provides for the installation of the model LF FS 2 firestop spacer in a residential installation Since the pitch of the roof influences the opening size required at the roof level table 1 should be u...

Страница 6: ...himney 1Z x Min Air space Clear ance to Combustibles Chimney Section SK81 1 ft pipe SK818 18 pipe SK83 3 ft pipe SK84 4 ft pipe Top Spacer Zero Clearance to Combustibles at Side Spacers Glass Doors Mo...

Страница 7: ...Model I658 Clearance from Fireplace Opening to Sidewall When Wall Shield is not Used B36RA8 Hearth Extension Model I627 Hearth Extension Model I658 Minimum Clearance from Fireplace Opening to Sidewal...

Страница 8: ...hearth extension and the face of the fireplace To help prevent the crack from developing the hearth extension materials must be firmly fastened in place Wall ties should be screwed to the face of the...

Страница 9: ...yramid style chimney cap used to terminate chimney through a chase Includes adapter Flashing not included CF8CA Adapter kit Unites square termination with chimney pipe 202036 Housing extensions Extend...

Страница 10: ...3 Min Storm Collar Flashing Roof Joist Shields Attic Space Refer to Table 1 for Roof Opening Size FS Firestop Spacer 14Z x x 14Z x Framed Opening 1Z x Clearance to Com bustibles with Firestop SK8 Seri...

Страница 11: ...tional for cold climate not a requirement for unit op eration Termination Cap Storm Collar Pan Flashing Draftstop Top Spacer Surround Screen Firebox Metal Safety Strips 1 2 or 3 pieces Nailing Flange...

Страница 12: ...oist 1Z x Clear ance to Combus tibles When Using Firestop Max Installation Height 86 14Z x Square Hole in Joist 1Z x Min Air Space Clear ance Between Chimney and combustibles Firestop Spacer Firestop...

Страница 13: ...arances as specified by this in struction manual 3 Set the fireplace in the desired location and be sure it is securely supported and leveled Install metal safety strip for hearth extension as shown b...

Страница 14: ...eplace Model C36RMA B36RA8 with RLK Louver kit WB36LR Glass Door and OAC6 Combustion Air Model C36LMA not shown same as above except uses LLK Louver Kit on the B36LA8 fireplace Cool Air Inlet WB36LR G...

Страница 15: ...ge to the chimney 4 Install firestop spacers at each ceiling level 5 Install the proper chimney cap or chimney housing on the chimney to prevent the entry of rain and debris into the chimney and to as...

Страница 16: ...to the chimney exit B36LA8 B36RA8 Maximum 90 0 Minimum Without Elbows 15 6 With 2 Elbows 17 6 With 4 Elbows 21 0 B Do not use more than 4 elbows per chimney Attach the straps of the return top elbow t...

Страница 17: ...lace may be used 6 A guy wire stabilizer is required for chimneys extend ing more than 6 1 8 m above a roof line The Ten Foot Rule Major U S building codes specify a minimum chimney height above the r...

Страница 18: ...hase it is also a good idea to install a firestop at the first ceiling level above the fireplace and enclose the chase with sheeting material Insulation may then be installed above sheet ing material...

Страница 19: ...size of the hole in ceiling will vary with the angle at which the chimney passes through ceiling Drive a nail up through ceiling at marked chimney center point Go to floor above and see where hole wil...

Страница 20: ...is used to keep pipe spaced properly and required for safety Nail the firestop spacer at each corner to the framing members of the ceiling hole Note A firestop spacer is not required at the roof Hole...

Страница 21: ...chimney termina tion installed Refer to installation instructions provided with the chimney termination to find correct size of roof hole There must be an air space 1 38 mm with SK8 between outermost...

Страница 22: ...E Firestop Spacer 14Z x x 14Z x Maximum four 4 elbows Per Fire place Offset Max 10 Support Straps Diagonal Chimney Enclosure Vertical Chimney Enclosure Recommended Diagonal Chimney Enclosure Acceptabl...

Страница 23: ...an exterior location which is not likely to be accidentally blocked in any manner The assembly should be located above the snow line to prevent blockage by snow accumulation 3 The combustion air inlet...

Страница 24: ...e fireplace with the four 4 sheet metal screws provided Figure 24 3 Cut a 6 diameter opening for model OAC4 in the out side wall covering where the model OAC4 outside grille is to be located Figure 26...

Страница 25: ...sions on the fireplace The following instructions only apply to passing the gas line through the fireplace wall Follow the instructions provided by the appliance for the gas line testing and ad justin...

Страница 26: ...is manual Page 13 Figure 10 Combustible mantels and trim must be installed in accordance with the National Fire Protection Association ANSI NFPA 211 Standard Section 7 2 3 3 Glass Door Installation Th...

Страница 27: ...rer Recommendation Top Edge of Fireplace Opening Mantel Installation Do Not Install Combustible Facing Material Below Top Edge of Fireplace Air Inlet Opening CAUTION Never block bottom air inlet openi...

Страница 28: ...blems If your fireplace is equipped with an outside combustion air assembly open the combustion air inlet by pushing upward on the lever located above the firebrick on the left side of the firebox NEV...

Страница 29: ...ced on a noncombustible floor or on the ground well away from all combustible materials pending final disposal If the ashes are disposed of by burial in soil or otherwise locally dispersed they should...

Страница 30: ...the chimney 9 Do install firestop spacers at each ceiling level when the chimney is installed in a multistory building 10 Do install the proper chimney cap or chimney housing on the chimney to preven...

Страница 31: ...larly 21 Don t operate the fireplace with the glass fire screen doors partially open The doors should always be fully open or fully closed 22 Don t use gasoline kerosene engine oil or charcoal lighte...

Страница 32: ...Y 40361 www mhsc com Item Description Qty B36RA8 B36LA8 1 Retainer Side Brick 1 020270 020270 2 Retainer 2 Z19901 Z19901 3a Firebrick Side Assy Right 1 014012 3b Firebrick Side Assy Left 1 021663 4 Ro...

Страница 33: ...87D0176 33 B36LA8 B36RA8 Woodburning Fireplaces...

Страница 34: ...34 87D0176 B36LA8 B36RA8 Woodburning Fireplaces...

Страница 35: ...your local building code contains restrictions on the use of this fireplace before you purchase it Blowers or fans which are warranted separately Heat loss due to the passage of heat or air through o...

Страница 36: ...MHSC 149 Cleveland Drive Paris Kentucky 40361 www mhsc com...

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