Lennox Merit Plus MP-420D Installation Instructions Manual Download Page 5

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

5

Figure 4

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

Chase Enclosure - Indoor Installation

Figure 3

Damper
Closed

Damper

Open

Lintel

Combustion Air Actuator

(when installed)

Hearth

Hearth

Optional

Outside Chase

LIVING SPACE

PATIO

Indoor Locations - Top View

Indoor Locations 

- Carefully consider the 

position of the fi replace opening with re-
spect to the location of adjacent or nearby 
stairwells, bath or kitchen exhaust fans 
and/or return air registers for forced air 
furnaces/air conditioners that could cause 
a smoking fi replace condition if the house 
is tightly insulated.

Figure 5

Outdoor Locations - Top View

Figure 6

When choosing a location, care must be taken 
to avoid places where fl ooding or running 
water may be a problem.

DO NOT place furniture or other items such 
as plants or decorative objects within 60” of 
the fi replace front face.

Figure 7

   

Clearances

Frame Surface Not to Be Covered
With Combustible Materials

12"

Wall
Covering

45°

12"

1"

Door

Opening

Safe

Zone

Restrictions for Outdoor installations:

• 

Outside Air Kit must be installed and 
fully open on the outdoor installation. On 
the indoor installation is optional unless 
mandated by local building codes. 

•  Minimum chimney height for the outdoor in-

stallation is 7' 9" (one 4 foot pipe section).

•  Minimum 2" chimney clearance is required 

when system height is less than 15'. 

•  Only non-combustible materials are allowed 

on the front face (Front Fireplace Frame) and 
around the perimeter within 5” (full length of 
top spacers) on the top and 1/2" on the sides 
(see 

Figures 1, 51 & 52). 

Combustible materials may project beyond the 
sides of the fi replace opening as long as they 
are 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), fl oor - 0” (0 mm), adjacent wall - 12” (305 
mm), ceiling - 37 1/2” (953 mm).

Note:

 Clearance at the nailing tab is 0" (0mm) 

(see

 

Figure 25

).

Note:

  Adjacent wall considerations are for 

an adjacent wall on only a single side.  Walls 
should not be placed at minimum distance at 
both sides of the fi replace.

       CAUTION 

To ensure that the outside air 
kit remains open for an outdoor 
installation, this fi replace should 
not have a combustion air gate 
control installed (OAKG-OD).  If 
this unit is installed indoors, 
you must install the outside 
combustion air cover provided or 
an optional outside air kit gate 
(OAKG-OD) before the fi replace 
is framed in place. 

       ATTENTION 

Assurer que les restes extérieurs 
de kit d’air ouverts pour une instal-
lation extérieure, cette cheminée 
n’ont pas une commande de porte 
d’air de combustion a installé 
(OAKG-OD). Si cette unité est 
installée à l’intérieur, vous devez 
installer la couverture extérieure 
d’air de combustion fournie ou 
une porte extérieure facultative 
de kit d’air (OAKG-OD) avant 
que la cheminée soit encadrée 
en place.

LOCATION OF FIREPLACE

Carefully select the proper location for heat 
circulation, aesthetics, chimney obstructions, 
air inlet location 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. 

 

See 

Figures 5 & 6

 for examples. 

When locating the fi replace, consideration 
must be given to combustibles and fi nal 
fi nishing.  See 

Figure 5

 and confi ne the fi nal 

location of combustible fi nish materials to 
the "Safe Zone."

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

Outdoor Locations 

- Carefully consider the 

position of the fi replace opening with respect 
to the location of adjacent or nearby stair-
wells, doors, windows, walk ways and over 
hanging trees, patios and wires.

Optional 
Hearth 
Extension

Air Inlet (inlet 
must be free of 
any obstructions)

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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