Installation manual
www.fmiproducts.com
108918-01K8
VENTING INSTALLATION
Continued
Figure 9 - Typical Offset Installation
Return
Elbow
Offset
Elbow
Return
Elbow
Offset
Elbow
6'Max.
6'Max.
6'Max.
6'Max.
6'Max.
6'Max.
Return
Elbow
Offset
Elbow
Offset
Elbow
Return
Elbow
A B C
Offset
Elbow
Ceiling
SupportPipe
12S-8DM
Return
Elbow
ASSEMBLY AND INSTALLATION OF 
DOUBLE WALL CHIMNEY SYSTEM
Eachdoublewallchimneysectionconsists
ofagalvanizedouterpipe,astainlesssteel
inneruepipeandawirespacer.Pipesec-
tionsmustbeassembledindependentlyas
chimneyisinstalled.Whenconnectingchim-
neydirectlytoreplace,inneruepipesec-
tionmustbeinstalledrstwithlancedside
up.Outerpipesectioncanthenbeinstalled
overuepipesectionwithhemmedendup.
Pressdownoneachpipesectionuntillances
securely engage hem on replace starter.
Wire will assure proper spacing between
innerandouterpipesections.
Note:  For  Canada, use chimney parts  des-
ignated HT.
 Opening in collar around 
chimney at top of replace must 
not  be  obstructed. Never  use 
blown insulation to ll chimney 
enclosure.
Continue to assemble chimney sections as
outlined, making sure that both inner and
outerpipesectionsarelockedtogether.When
installingdoublewallsnap-lockchimneyto-
gether,itisimportanttoassurejointbetween
chimneysectionsislocked.Checkbypulling
chimneyupwardafterlocking.Chimneywill
not come apart if properly locked. It is not
necessarytoaddscrewstokeepchimneyto-
gether(exception-seeFigure11,page9).
USING ELBOW OFFSETS (30E-8DM)
1. Toachievedesiredoffset,youmayinstall
combinations of 12", 18", 24", 36" and
48"lengthofdoublewallpipe(seeoffset
chart,page7,andFigure9).
 Note: For systems with 2 elbow sets, mini-
mum height is 22 feet. Maximum height 
for any system is 50 feet.
2. Chimney weight above offset rests on
return elbow. Straps must be securely
nailedtoraftersorjoists(seeFigure10,
detailsAandB,page9).
3. Maximumlengthofpipebetweensupports
(returnelbowor12S-8DM)is6'ofangle
run.Maximumoftwo6'anglerunsections
perchimneysystem(seeFigure9).
4. Allpipeconnectionsbetweenoffsetand
returnmustbesecuredwithtwoscrews
onouterpipeonly(seeFigure11,page
9).Donotpenetrateinnerstainless.










