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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

2

TABLE OF CONTENTS

Safety Rules ......................................Page  2
Tools and Building Supplies ..............Page  2
Precautions .......................................Page  2
Introduction ......................................Page  3
Clearances/Height Requirements ......Page  4
Chimney System ...............................Page  4
Assembly Outline ..............................Page  4
Location of Fireplace .........................Page  5
Clearances ........................................Page  5
Assembly Steps ................................Page  6
Preinstallation Notes .........................Page  6
Waterproofi ng Fireplace ....................Page  6
Outside Air Kit   .................................Page  6
Fireplace & Framing Specifi cations ...Page  9
Installing the Fireplace ......................Page  10
Installing the Chimney System ..........Page  12
30° Offset through Floor/Ceiling .......Page  13
Ten Foot Rule Summary ....................Page  15
Multiple Terminations .......................Page  15
Chimney Component Calculations ....Page  15
Special Offset Instructions ................Page  15
Offset Calculations ............................Page  16
Vertical Elevation Charts  ..................Page  15
Installing Offsets ...............................Page  16
Offset Elevation Chart ........................Page  18
Gas Line Connection .........................Page  18
Vent Free Appliances .........................Page  19
Glass Doors ......................................Page  19
Cold Climate Insulation .....................Page  20
Fireplace Finishes - Mantels and Trim ..Page 20
Hearth Extensions/Wall Shields ........Page  20
Finish Requirements .........................Page  22
Installation Components ...................Page  23

PLEASE READ AND 
UNDERSTAND THESE 
IMPORTANT 

SAFETY RULES.

 

 •  The manufacturer is not responsible for any 
smoking or related problems that may result 
from the lack of adequate combustion air. It 
is the responsibility of the builder/contractor 
to ensure that adequate combustion air has 
been provided for the fi replace.

 

•  An 

Outside Air Cover 

(provided) or an 

Out-

side Air Kit

 

Gate, model OAKG-OD

  (optional) 

must be installed to prevent signifi cant cold 
air infi ltration.

13.

 Always ensure that the air inlet to the fi replace 

is free from debris and any other obstructions 
that can block the entrance of air.

14.

 DO NOT use a fi replace insert or any other 

product not specifi ed by Lennox for use 
with this fi replace.  All gas log sets must 
be operated with the damper clamped open, 
including unlisted “vent free” log sets. Listed 
“vent-free” log sets may be operated with 
the damper closed.

15.

"Smoke free” operation is not warranteed 

nor are we responsible for inadequate sys-
tem draft, general construction conditions, 
inadequate chimney heights, adverse wind 
conditions and/or unusual environmental 
factors or conditions beyond our control.

16.

Never, under any circumstances, install a 

fi replace, chimney component or any acces-
sories, that has visible or suspected physical 
damage as a result of handling or transporta-
tion. These items should be inspected by your 
distributor or qualifi ed factory representative 
to ensure safe condition. When in doubt, 
consult your distributor.

17.

 For additional safety considerations and 

complete operating instructions, refer to 
the Care and Operation Manual provided 
with the fi replace.

1. 

Before starting your fi replace installation, 
read these installation instructions carefully 
to be sure you understand them completely 
and in entirety. Failure to follow them could 
cause a fi replace malfunction resulting in 
serious injury and/or property damage.

2.

 Always check your local building codes. 

The installation must comply with all lo-
cal, regional, state and national codes and 
regulations.

3.

 This fi replace must be installed with Security 

Chimneys FTF8 [8" (203mm) inside diam-
eter] Chimney System only. This fi replace is 
intended for indoor or outdoor installations. 
The chimney system must always vent to 
the outside of the building or structure.

4.

 To ensure a safe fi replace system and to 

prevent the build-up of soot and creosote, 
inspect and clean the fi replace and chimney 
prior to use and periodically during the heat-
ing season.

5.

 Burn approved fuels only as defi ned in the  

Homeowner's Care and Operation Manual.

6.

 NEVER use gasoline, gasoline-type lantern 

fuel, kerosene, charcoal lighter fl uid, or 
similar liquids to start or “freshen up” a fi re 
in this fi replace. Keep any fl ammable liquids 
at safe distance from the fi replace.

7.

 NEVER leave children unattended when there 

is a fi re burning in the fi replace.

8.

 Always keep fl ue damper open when heat is 

present in the fi replace.

9. 

 Before servicing, allow the fi replace to cool. 
Always shut off any gas to the fi replace 
while working on it.  This will prevent the 
possibility of burns.

10.

This fi replace is not a heater. It is designed 
to ensure homeowner comfort by providing 
supplemental heat to its immediate area.

11.

 Keep screens closed after feeding fi re to 
keep embers from fl ying out ot fi replace.

12.INDOOR INSTALLATIONS: 

  • Always ensure that an adequate supply 

of replacement combustion air from the 
outside of the house is accessible to the fi re 
to support normal combustion. Fireplaces 
consume large volumes of air during the 
normal combustion process.

  • In the event the home is tightly sealed 

with modern energy effi cient features, the 
optional outside air kit may not provide all 
the air required to support combustion.

PACKAGING

The assembled indoor/outdoor fi replace is 
packaged with:
1 - One envelope containing the literature pack-

age which consists of the homeowner's 
manual, installation instructions, warranty 
and combustion air cover (located in the 
fi rebox).

2 - One Outside Air Kit.
3 - Hearth Extension Strips.

       WARNING 

To avoid the risk of damaging 
fi replace materials and increas-
ing the risk of fi re, do not use the 
fi replace to cook or warm food.

       AVERTISSEMENT 

Pour éviter le risque 
d’endommager les matériaux 
du foyer et d’augmenter le 
risque d’incendie, n’employez 
pas le foyer pour faire cuire ou 
réchauffer de la nourriture.

TOOLS AND BUILDING SUPPLIES

NORMALLY REQUIRED

Tools

Supplies

Phillips screwdriver
Hammer
Saw and/or sabersaw
Level
Measuring tape
Plumb line
Electric drill and bits
Pliers
Square

Framing materials
Wall fi nishing materials
Caulking materials
    (noncombustible)
Fireplace surround and
    hearth  extension 
    materials 
   (noncombustible)

PRECAUTIONS

The most important areas of concern dealing 
with the installation of factory-built fi replaces 
are clearances to combustible materials, proper 
assembly of component parts, height of the 
chimney system, the proper use of accessories 
supplied by the manufacturer and the techniques 
employed in using fi nishing materials applied to 
the wall surrounding the fi replace, hearth exten-
sions and wall shields.  Each of these topics will 
be covered in thorough detail throughout this 
manual. Please give each your special attention 
as you progress with your installation.

Summary of Contents for Merit Plus MP-420D

Page 1: ...EQUIPPED TO BE READILY IN STALLED OUTDOORS IF INSTALLED INDOORS YOU MUST INSTALL THE COMBUSTION AIR COVER PROVIDED WITH THE INSTALLATION KIT OR PURCHASE THE OPTIONAL OUTSIDE AIR KIT GATE OAKG OD SEE...

Page 2: ...tate and national codes and regulations 3 ThisfireplacemustbeinstalledwithSecurity Chimneys FTF8 8 203mm inside diam eter Chimney System only This fireplace is intendedforindoororoutdoorinstallations...

Page 3: ...always maintain minimum clearances to combustible materials and do not violate any specific installation requirements These fireplaces have been tested and listed by OMNI Test Laboratories Inc Report...

Page 4: ...materials Outdoor installations less than 15 height require chimney clearance of 2 air space to insulation and construction materials In Canada the chimney and fireplace outer wrapper require a minimu...

Page 5: ...kept within the shaded areas illustrated in Figure 7 CLEARANCES Minimum clearance to combustibles for the appliance is as follows sides and back 1 25 mm floor 0 0mm adjacentwall 12 305 mm ceiling 37 1...

Page 6: ...t If you plan to raise the fireplace and hearth extension build the platform assembly then position fireplace and hearth extension on top Secure the platform to the floor to prevent possible shifting...

Page 7: ...the outside air kit is NOT installed you must install the Outside Air Cover provided with the instructions kit b IfanoutsideairkitISinstalled theOutside Air Kit Gate must be installed see Page 23 of o...

Page 8: ...ons Outside Air Kit Installation provided These appliances are equipped with a com bustion air inlet collar so that it is possible to duct combustion air from the outdoors to the firebox To accomplish...

Page 9: ...g Materials if any Rough Framing Face Unfinished Shown Combustion Air Kit Optional Framing Dimensions A 46 1 2 1181 mm B1 43 1 2 1105 mm B2 60 1 2 1537 mm C 33 828 mm D 17 1 2 445 mm E 76 1 4 1937 mm...

Page 10: ...ions must not interfere with circulating grillwork Figure 19 Figure 20 A B Ceiling Framing C D Roof Framing Framing Dimensions for Ceiling Inches millimeters Flue Type A B FTF8 Vertical USA 14 1 2 368...

Page 11: ...les espaceurs du dessus du foyer voir le sch ma 13 ne peuvent tre retir es ou modifi es vous ne pouvez pas entaillez le colombage pour ajuster autour ou tre install plus bas que les espaceurs Le colom...

Page 12: ...and outer wrapper require a minimum 2 air space to insulation and construction materials Reference Figures 19 20 and charts Framing DimensionsforCeilingandRoof whichspecify minimum ceiling and roof di...

Page 13: ...e the building must be con structed with galvalume outer sections only Theappropriatemodeldesignationsarelocated in the back of this manual F8FS30 Firestop Spacer FTF8 S4 Stabilizer 1 Min Air Space 30...

Page 14: ...as noted in Step 4 Step 6 Select the proper Security Chimneys roof flashing based on pitch of roof Use chart below for selection Figure 37 Note Do not caulk or seal the ventilating open ings or seal t...

Page 15: ...chimney must be at least 2 above this reference point In all cases thechimneycannotbelessthen3 above the roof at the edge of the chimney The 2 in 10 rule is necessary in the interest of safety but doe...

Page 16: ...36 48 11 0 11 1 0 0 0 17 1 5 0 1 0 0 21 1 9 2 0 0 0 27 2 3 1 1 0 0 35 2 11 0 0 1 0 47 3 11 0 0 0 1 51 4 3 0 1 1 0 57 4 9 1 0 0 1 63 5 3 0 1 0 1 67 5 7 2 0 0 1 73 6 1 1 1 0 1 81 6 9 0 0 1 1 93 7 9 0 0...

Page 17: ...the Straight Up In stallation Instructions for cutting and framing ceiling and roof openings Note See Framing and Dimension Chart for the sizes of the ceiling and roof openings The size of the roof op...

Page 18: ...ilizer Considerthiswhen determining the need for a stabilizer Note Do not apply excessive pressure to any subsequent chimney section following return elbow assembly when installing Ensure that each su...

Page 19: ...c tions are placed lower than 18 inches from the fireplace opening These fireplaces have been marked with a maximum rating of 26 000 BTU to assure that homeowners do not exceed the allowable limits fo...

Page 20: ...ux non combustibles il se pourrait qu il n y ait pas suffisament de d gagement pour installer les portes de verre de votre choix Assurez d avoir un d gagmet suf fisant tout moment afin de ne pasinterf...

Page 21: ...es 416 x 1 Answer TheminimumrequiredthicknessoftheMicore160is 417 there fore round up to nearest standard thickness available which is 1 2 Using the r formula Note To convert inches to millimeters div...

Page 22: ...ormal wall decor with elaborate mantels to rustic wood paneling or warm brick facings Only noncombustible materials like stone tile brick etc may overlap the black front facing Do not extend these mat...

Page 23: ...ith fireplace Shownhereforre placement purposes only Locking Band 63L60 FLB Ref Form 750 080M Spark Arrester 63L57 FSA 2 Ref Form 750 198M INSTALLATION COMPONENTS The following items are available for...

Page 24: ...n For open top shrouds 96L20 FTF8 CTT Ref Form 750 077M Chimney Pack conventional Convenience Pack Residential 63L70 FTF8 CP7 Contains 3 FTF8 36 1 F8FS 1 F8F6 1 FTF8 CTD 7 P C 8 F T F R O I R E P U S...

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