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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

4

Figure 2

Chimney Height

The total height of your completed fireplace sys-
tem from the surface the fireplace rests on to the
chimney top must not exceed 50' (15.24 m) and
must also meet minimum height requirements.
Refer to the minimum system height chart.

Minimum System Height

FTF10

FTF8

Vertical

15'2"

16'8"

Installation

(4.62 m) (5.08 m)

One

15'2"

16'8"

Offset

(4.62 m) (5.08 m)

Two

25'0"

25'0"

Offsets

(7.62 m) (7.62 m)

LOCATION OF FIREPLACE

Carefully select the proper location for heat
circulation, aesthetics, chimney obstructions
and clearance to side wall(s). With proper pre-
planning, a slight adjustment of a few inches
can save considerable time and expense later
during construction and assembly.

Figure 4

Carefully consider the position of the fireplace
opening with respect to the location of adja-
cent or nearby stairwells, bath or kitchen ex-
haust fans and/or return air registers for forced
air furnaces/air conditioners that could cause
a smoking fireplace condition if the house is
tightly insulated.

When locating the fireplace, consideration must
be given to combustibles and final finishing.
See 

Figure 5 and confine the final location of

combustible finish materials to the "Safe Zone".

DO NOT permanently place furniture or other
items such as decorative pillows within 60" of
the fireplace front face.

Insulate Joists

Same As Ceiling

Draft Stops

Firestop

CTDT

Termination

Note: Non-

Combustible

Chase

Flashing

Must Be

Used To

Cover

Chase

Opening

Optional

Insulation

In Outside

Walls Of

Chase

Solid

Continuous

Surface

Outside

Base

Insulation
(Thermal Barrier)

8'

Level

Note: Do not insulate the chase cavity with
blown or fill type insulation materials.

Note: Local codes may not require firestopping
at the ceiling levels for outside chase installa-
tions. However, it is recommended for safety
and the reduction of heat loss.

Figure 5

Chase Enclosure

A chase is a vertical box-like structure con-
structed to surround the fireplace and chimney.
Refer to 

Figure 2  for a typical chase configura-

tion. As with all chimney installations, avoid
overhead obstructions such as trees, power
lines, etc. A chase should be constructed and
insulated just like any outside wall. In a cold
climate, we recommend the base of the chase
should also be insulated between the solid
continuous floor beneath the fireplace and the
chase bottom. Chase insulation in a cold cli-
mate installation is not required for safety.

ASSEMBLY OUTLINE
Before You Start

Check your inventory list to be sure you have all
the necessary parts supplied in good usable
condition. Check also for any concealed damage.

Check the operation of the damper. The damper
is controlled through the use of a control lever
located within the firebox opening at the top
center just behind the firebox lintel (

Figure 3 ).

The control lever snaps into place at the ex-
treme range of motion, up and back in the
closed position.  When pulled forward and
down, the damper is open.

Figure 3

Damper

Closed

Damper
Open

Lintel

Combustion
Air Actuator

Inside

Corner

Installation

Hearth

Hearth

8" (203mm) Min.
To Protected Side
Wall

Outside
Corner
Installation

12"

Min. Distance To

Unprotected Side Wall

8"

45

°

Combustible

Materials

Allowed In

Shaded Area

“Safe Zone”

8"

Min. Distance To

Protected Side Wall

Fireplace

11 

⁷⁄₈

15 

⁷⁄₈

WARNING: IF INSULATION IS USED, THE
FIREPLACE MUST NOT BE PLACED DI-
RECTLY AGAINST IT. INSULATION OR
VAPOR BARRIERS, IF USED, MUST FIRST
BE COVERED WITH GYPSUM BOARD,
PLYWOOD, PARTICLE BOARD OR OTHER
MATERIAL TO ASSURE INSULATION AND
VAPOR BARRIERS REMAIN IN PLACE.

WARNING: DO NOT PACK OR FILL RE-
QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS.

Summary of Contents for Merit CR-3835L

Page 1: ...y circumstances Any modification or alteration of the fireplace system including but not limited to the fireplace chimney components and accessories may void the warranty listings and approvals of thi...

Page 2: ...afe distance from the fireplace 8 NEVER leave children unattended when there is a fire burning in the fireplace 9 Always keep flue damper open when heat is present in the fireplace 10 Before servicing...

Page 3: ...BOCA Basic National Codes the Standard Me chanicalCodeandtheUniformBuildingCodes When complete these fireplace systems con sists of five basic sub systems 1 The Fireplace 2 The Chimney and Termination...

Page 4: ...re firestopping at the ceiling levels for outside chase installa tions However it is recommended for safety and the reduction of heat loss Figure 5 Chase Enclosure A chase is a vertical box like struc...

Page 5: ...n Each installation is unique however and might require a different sequence 1 Position firebox prior to framing or into prepared framing 2 Install the chimney system 3 Connect house wiring to the fir...

Page 6: ...2 mm Class 0 air duct provided to the collar on the chimney collarenclosurewiththescrewsprovidedinthe hardware kit IMPORTANT UNDER NO CIRCUMSTANCES CAN THE FIREPLACE TOP SPACERS FIGURE 6 BE REMOVED OR...

Page 7: ...432mm 610 mm 483mm 660 mm Perpendicular to roof ridge A B Ceiling Framing C D Roof Framing Framing Without False Header Header B A C Outside Corner C A Back Wall of Chase Encloslure Including Finishi...

Page 8: ...W MINIMUM 2 51 MM CHIMNEY AIR SPACE TO COMBUSTIBLE FRAMING MEMBERS THROUGHOUT VERTI CAL OR OFFSET CHIMNEY INSTALLATION SEE NOTE A minimum 2 51 mm air space must be reserved for all combustible materia...

Page 9: ...om Above 10 Max Room Above 2 Min Air Space 2 Min Air Space Figure 23 Outer pipe section installs in just the opposite way the lanced end goes down and each new section goes OVER the outside of the pre...

Page 10: ...ote Do not caulk or seal the ventilating openings Step 7 Secure flashing by nailing along the perimeter into roof using 8d nails If shingled roof slide upper end and sides of roof flashing under shing...

Page 11: ...smoke free opera tion Trees buildings adjoining roof lines ad verse wind conditions etc may require a taller chimney should the fireplace not draft properly see Figure 32 MULTIPLE TERMINATIONS If more...

Page 12: ...ng Do not puncture the inner flue Maximum offset of chimney system is 30 Two offsets must not be assembled to form a 60 offset However two sets of offset and return elbows may be used on a single flue...

Page 13: ...imney Components Chimney Only Inches Feet Inches 12 18 24 36 48 S4 Meters 247 20 7 0 1 0 0 5 6 29 253 21 1 0 0 1 0 5 6 44 257 21 5 1 1 0 0 5 6 55 263 21 11 1 0 1 0 5 6 70 269 22 5 0 1 1 0 5 6 85 275 2...

Page 14: ...hes Feet Inches 12 18 36 MM M 461 38 5 0 1 13 11722 11 72 465 38 9 2 0 13 11824 11 82 471 39 3 1 1 13 11976 11 98 479 39 11 0 0 14 12179 12 18 489 40 9 1 0 14 12433 12 43 495 41 3 0 1 14 12586 12 59 4...

Page 15: ...1 1073 2064 44 85 1 1 0 1 1 1 0 1124 2159 45 86 1 1 0 0 1 0 1 1149 2197 47 90 1 1 0 0 2 1 0 1200 2286 48 91 1 1 0 0 0 2 0 1226 2330 49 93 1 1 0 2 1 1 0 1251 2381 51 97 1 1 0 1 4 0 0 1308 2470 53 100 1...

Page 16: ...59 1 0 0 1 1 743 1505 31 63 1 0 2 0 1 794 1600 32 65 1 0 4 1 0 826 1651 34 68 1 0 1 1 1 870 1734 36 71 1 0 3 0 1 921 1822 37 73 1 0 0 2 1 946 1861 38 75 1 0 0 0 2 972 1905 39 77 1 0 2 1 1 997 1956 41...

Page 17: ...stall the same as chimney sections First snap the inner section INTO the preceding inner section of flue Check connec tion by pulling up slightly to ensure a tight fit Next the outer sections snap loc...

Page 18: ...ed with all fireplaces It is to protect the combustible floor in front of the fireplace from both radiant heat and sparks The hearth extension must extend 8 beyond both sides of the fireplace opening...

Page 19: ...3 85 3 7 8 Super Firetemp M Johns Manville 61 1 64 73 3 4 Super Firetemp L Johns Manville 54 1 85 64 5 8 Face brick 9 00 111 10 71 10 3 4 Common brick 5 00 20 5 95 6 Cement mortar 5 00 20 5 95 6 Cera...

Page 20: ...T BE SEALED WITH A NON COMBUSTIBLE MATERIAL Calculating Minimum Thickness if Multiple Materials are Used At times it is important to know what combination of materials are acceptable for use as floor...

Page 21: ...e Combination 63L28 FTF8 OR15 Offset Return Elbow 63L34 FTF10 OR15 Starter Section 8345 FTF8 SS Attic Shield Assembly Firestop Spacer 63L67 FTF8 FSAS Canada Only 63L68 FTF10 FSAS 63L10 FTF8 12 63L13 F...

Page 22: ...r Flat 63L36 F10FS 2 Outside Combustion Air Kits with duct 81L87 FOAK without duct 81L88 FOAK LD 63L25 FTF8 S4 Stabilizer 63L26 FTF10 S4 Chimney Pack Conventional 63L70 FTF8 CP7 Contains 3 FTF8 36 1 F...

Page 23: ...NOTE DIAGRAMS ILLUSTRATIONS NOT TO SCALE 23 NOTES...

Page 24: ...850 048M REV N C 01 2007 1110 West Taft Avenue Orange CA 92865 The manufacturer reserves the right to make changes at any time without notice in design materials specifications prices and also to disc...

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