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INSTALLATION AND MAINTENANCE
' INSTRUCTIONS FOR MODELS M & MO
MNrirFACTUAER WiaolN!7 %
_ 1 FaPoPo FMAAONMENTAr. 6YST4M9 - '
I
ilile symbol on Iho nameplate
means tills product Is listed by U�
Undorwr]tors Leboralorlos Ina. G
Lleking No. MR7860
Testing No. 441
GENERAL:
Iho Model M and MO Ciao Vents (0-Von1) have boon designed for use
Wih gas buming Catogory 1 appliances. A Category 1 appliance oper-
ates with a non•poslilvo vent slallo pressure and with a vent tompora-
tore that avoids excessive condensate production In the veal.
ID -Vent Is of double Well construellon with the Inner flue of aluminum
alloy (allowing for rapid wormup and Wier draft) and ilia outer casing
Of galvanized steed orgatvalumo steel.
Model M 8-Vent Is compatible vdth listed masonry iollnbig systems,
single walk conneators and other listed gas vents. Modal M B Vent may
be used to rallno masonry ehlrnnays (Separate Instructions are avall-
able from Mollal-Fab).
Modal MO, Oval Gas Vsn1 Is deslgnad lot Installation within 2" x 4" or
2" x 6' wall studs and for venling of wall mounlad lurnacas. Tronsilion
from oval to round for lowest cost installation Is easily obtained.
SAFETY:
CAUTION. UL approval Is based on using B-Vent components
supplied by Metal -Fob, Inc, performance may be, affected and a
safety hazard created Jl parka shown in these instruotlons are not
used.
1. Motal-Fab D-Van[ pipe and fillings ware designed and are listed to
form a continuous passageway from the gas burning appifarkm to
file vent lorminailon above Iho roof, Including lie vent cap.
2. These 0-Vant components are la he Installed whit minimum one
Inch clearonoo to combustible niaterlal. Strap vent in ptaco, ospo-
ciatly on laforal or horizontal runs, to molnlaln proper clearances to
cornbus11bla. Do not pact( lnaulullon or olltior mulorlala armind tho
B-Van1.
3. When Inslalling D-Vern always align "Up• arrow away from appll-
anco.
4. Locata vent as close as possible to Bpplluioe to obtain maximum
draft and minimize conneolor pipo length.
U. For horizontal runs, rnninlaln a pitch or rise from like appliance.
Minimum Ass la 1141nch (6.4 mm) per fool (305 men).
D. A 8-Vent Cap should he used on all Installations to prevent back
drags and to keep out rain and dabrls. The Vent must extend
through a fleshing, and should iormlnate with the lowosl discharge
opening, no closer 10 Ilia roof Ilan the minimum helghl shown In the
table below. Thalia minimum heights may be used provldod Ilia
vent is not lose Ilion W from any vortical wall:
TABLE 1
nool Pilch
Mlnlmtren IFI01ght
Fiat to W12
9013 ram)
1,0 fool
Over 7112 to 8112
461 mat)
1.6 real
Over off 2 to Ull2
610 mm
1762
2.0 foot
Over 91121010112
mm
2.5 rant
Over 10V12 to 11f42
(901 lam
3.26feet
Over 1 i112 to 12112
((1216 nnm
d.0 luel
Over 12112 to 14112
(1524 mar
6.0 loot
Over 14112 to 19112
(1829 ram
6.0 foot
Over 16A2 to toll 2
(2134 ram
7.0 foal
Over 1(V12 to 2102
2206 min
7.6 fool
Over Wl2 to 2iV12
12431I mm)
0.0 feet
GAS VENTS (D-VENT)
Round Sires 3' (76 mm) through 14" (W &
Oval Size 4" (102 min) ihraugh 6" (162 mm)
For installations col covorad by the abovo, Including sizes larger
Ilion 121, like lowost dlschorga opening of Rio vent cap should be, at
least 2' above the highest point %where It passes giraugh the mor,
and at leeet 2' higher than any poillon of a bullding within 19 hori-
zontally:
7. Vent elzing Is deikted by tables in NFPA64 (ANSI Z223.1, 11392). as
contact your Modal -Fab supplier. Install In accordance with Ihess
Inatrucilons and local code roqulrements.
8. D-Von% Is to be, used to veal apppproved gas appliances Intended to
burn only Use. Typo D-VBnl Is t+14I to be used wilki ilia following:
A. Unlisled Gas Appliances
H. Incinerators
C. Recessed Healers
D. Conversion Dinners
E. Gas1011 Burners
F. Any appllance which may be, readlly converted to a solid or
liquid fuel.
3. Any olhor appllance 140T Intended to bum only gas.
In areas whore solid or liquid ruola are common. Ilia vent locailon
should be, rnarkod 'For use vhlli vantod appllancee burning only
gee'.
9. Vonting Into an unl'uied rrrusonry chimnoy may uoirse condunssllon.
Install 13-Van[ or Molat-Fab metal linar Instdo iao chimney to pre-
vent condonsatlon.
10, When instal►Irig exterior veal. not enofosed by the structure or a
chase, consult local gas utility, appllanco manufacturer, aridlor
aulharily Raving )urisdtollon.
11. if a pwAmr van[ fan Is used, make aura it Is localad ELI ilia terminus
(exhaust and) al veal system, so err to rnelatafn nogallva pressure
vdihln lie van].
12.A D-Vent support pinto (IASP) Is raqulred If vertical hololit amoods
30 feel. %,lax monk of 30 fleet bBlwoon supports.
INSTALLATION:
nound D-Vant .
Tha Typpe M t3-Veni secllons and eompononts use tlis Modal -Fab posi-
tiva total lock for inlorconnootions. Align [Ile ends of the vent, push
together then told brie sealer, to lack In place. No addlllcml fastonars
era required to assure a safe Installation. it Is acceptable to apply
screws at the Joints It local dodo requires, or at ilia Insialling conVac-
We option, prob[dad that the screws do riot penetrato the Ilue.
J. Starting at lie appliance outlel, attach tho first soclon. It le acoWl-
ablo 10 use sorows to atlacb Ste B-Vant io the appllanco oullel. If
the appllanco hes a draft hood, the MOO draft hood connector Is
allachad to Iho tap of the draft fiood and the first B-Vent section Is
twist -locked to Ilia MOO,
2. If this Is a single, siralghl up installation, and ilia 0-Voni must porl-
otrale tiro eellrng, cut a ]tale in the tailing 2 Inchas 61 mm) larger
than the outelde diameter (OD) of tiro outer toeing. is B-Vont Is 10
be canlorad In this opening, When Installed, check to make Burn
tine ono Inch (25A min) choarence to combuallble has boon maln-
talnod. (Goo Flguro 1).
3. Vdion a combuellbio Iloor is ponolralod by D-Vent, a OAFS ilroslop
or MBP supped plate Is used to oloso the oponing. 1f the area
above the collhig is an auto, tho ilrostop or supporl plalo Is niount-
ed above Ilse joist to assure 11knt Insulation does not drop into Iho
Iola[ area.
-4. Continue wllh D-Vent penetrating ilia roof..NOTE: For Canadian
installations. use labeled ULC aoetlon, doslgnalod with Suffix G, on
vent socllone exposed to atmosphere. At The roai, the opening
should be 2 inches (51 mrn) greater than Ito 8-Vent 00. Above like
NEpcoal. a gashing Is required to mnbitain the one Inch (26A nwi) clear-
ance to. the combustibles of the roof. Installation of a storm collar
P ' aliows-aratorto drairrover the ilashlnp: Caulk as ehoYm In Fkguro-1.
6, jnalall ThB 0-Vonl cap (MC) onto Ilia 13-Vari1. NOTE: Boo height of
COUllrlls under "SAFETY".
6, If a UL Lletod gas vent other than Metal -Fab Is to be connected to
the Inlet and of the Modal -Fab B-Vend, use lite MGA. M12A, or
141111A gas Yank adapter, htsort the aisle and of the other gas von[
Into Itw gas vent adaptor and secure by ilghioning Uie clamp an the
adapter (Sao Figure 2A). It Modal -Fab D-Vent Is to bo Insoried
directly Into the Inlet and of a UL Lleted goe vent ollot lien Metal -
Fab, secure by Losing taros (3 114 Inch {0A ram) long shoot rnolal
screws. Do not penetrate the i uo (Sae Figure, 20).
7. Allhough It Is not a preferred practice, thore may bra inelollotfons
where B Vant must run vedlcaily-axtsdor to the building and wall
support is needed. A wall band (M%IVB) is used by Plocing around
ilia 13-Vent, [lien fastening to the wall. Using the MW13 assures that
file clearance to oombus]Ibfes Is malniataed (Sea Figure M.
0. Wltan the connector from lie appliance Is single wall, It must lerrnl-
note Into D-Vonl. At ]life tarmhiatlan, It Is accalilable to secure the
Joint wllh sliest matul screws. NOTE: Single wall connector, either
rigid or flexible, cannot be enclosed v4diln coitrbustlbla materials.
4. 111ita Installation requires Iwo appllancee 10 tarrnlriate Into a com-
mon D-Veal, a 13-Vent wyo or lee Is used. Ii Is recomatondod that
this higher outpul appllance, normally 11te furnace, Insert Into Ile
bottom of the wye or toe and ilia other appliance shah to ilia tap.
To minimize the tenglli of run and to provide maximum flexibility in
those installations, a swivel tee (1dST) or swivel wyo (MSY) Is usod.
These eornparionls provide 380 degrees of rotation to posillon ilia
lap In ilia proper arlontotion (Sea 1=k ura 4). NOTE: Consult the
Molel-Fab catalog for the many varlatlons of wyea and toes avail-
able.
10, It Is a common procllco to uUllzo the 00 dogroo adjustable elbow
(WD) In tho appliance area to minimize vent run. Ueo of tho M90 or
M45V60 9lbow Is aocoptebfo and not limped to Ilia appliance area.
tt For horizontal and lateral runs, 11 Is recommended that support be
used every S foot (1624 ram). Plumbers straps are corinnionly used.
Thoy stiauid ba positioned to ntarntaln the 1 uich (25.4 ram) clear-
ance to combrrs]Ibloa.
12. If your Installation requires a change in diameter due to vent capock
ly, a D-Vent increaser (MI) Is available. Instaltation is the same as
alerrdard B-Vent Serilons.
OVAL DENTS:
The 4MO and WO oval vents are flaked for use In 2" x 4" and 2" x 6'
alud walls, Willi firostoplspacar to maintain 1 inch clearance io com-
wallhlee. ilia BMO Is tesled for use In a 2" x 6' alud wall. Tile oval vonl
is Interlocked by pushing logsihor. The 4MO has a dual listing as L O
pad DW oval vent. ilia 411W Is used viillt recessed hieatow with maxl-
ntum outpput or 86000 I1TU1Hn (26 I(W) for single story and 65000
11TUfHR (iO KIN) forrnulti-story Inslallallons.
1. Normally the appliance oullot Is of a round sliepa. iliaiefore, it D-
VenT Section at Draftbood connector (NIDC) will be aflachod io Una
appliance. To Iransltlon to oval sections, a Round to Oval Adapter
(MRO) Is required. The ]root and coiling plates must be cut away, to
allow placoirient of [lie oval. To position the oval. and maintain
ciearanco to coinbusilbloe, a grestop (MOFS) Is used at the floor
and the telling (Sae Figure 5).
2. If the appliance Is In the same room as the entry 10 oval vent, the
oval lee (MOT) can bo Installed In llno wail studs. To close the, bol-
tom of the Too, use tho Toe Cop (NIOTC). To support the Too with -
In the wall DUN. use the Tee Support tMOTS). As lie oval vent
corillnues upward, uses ilia MOFS at tho colling loval (See 1`106re 6),
3. Normally, In the allic area, the oval van[ Iransitlona beck to like
round using lie Oval la Round Adapter %ton). The Installation Is
then terminated as a round Q-Vanl, as previously explained.
FIDU RE 2A
n
a
r BASE ION IIIOH OVERLAP FLASHING
J LI>- APPLY CAULKING On METAL•FAB
MST TAPE WNEnIt VENT PASSIEB -
TATIOUKIH FLASHING
APPLY THICK RING OF CAULKING
OEMrABSHAWST TAPE AROUND
l� SLIDE STOttW COLLAR DOWN INTO
CAULKING OR TAPE RING
II FInESTOP
i
CEILING PI
AWAY FU
OF STI.
FIGUHE 5 CUT AWAY PLATES R FLOOR
MOO OVAL VENTOA
CAULK (OR MST)
FLAGI(IND OVER ROOFING ON
DOWN SIDE. UNDERON UP 910E
METAL: FAA MSA,
M12A.MiSA I.INSEf%r9f4'TO11/2'
AMP MALE 01`00FOM VENT
URE OTHERT7IAN METAL -FAD
FIGURE 2®
FEMALE END OF OAS VENTI
01HERTHAN METAL•FAB
it
AFTER INSTALLATICN --�
SECURE WITH `3 114'
LONG SHEETMBTAL
BCnEws
STANDARD METAL-FAB
INVENT
INSCRT 314' TO 1 112'
"FIRESTOPSPACER NAIL
TO PLATE ATCOLING
INTEGRAL
SPACER
r
OVALGAS VENT PIPE
soSURE LOCK
ISENGAGED
AWAY
FIREBTOPSPACER
+ ITUDS
AT I SFLOOR
HALF OF
PIPE
MOBOSTORM COLLAR
MOF FLASHING#
—•SCCURE PLAgnme TO
130O2F • CAULK
TOOOOAMBUS IBLES CLEAsfANCC
�-MOOVAL VENT
1 OPEN ATTIC OP SINGLE
1 STORYORUPPER FLOOR
of MULT14TIORYULDG.
2 x 4 BTUDS Q
10' OTRB.
RECESSED
NEATER
IIEAOER
PLATE
1. Cut a hole In the oulslde wall 114" larger than the I _
diameter of the aleeve on wall thimble (MWT).
-- 2. Install the wall thimble by Inserling Ilse larger of
-- the _iwo-parts-on-the-a pllance-aide-and-the-oUier - ---
hall Ihrough the cutside wall.
3. hislell chimney Sections vertically, starting at the
elbow. Attach a WALL BRACKET EVERY SIX
FEET TO SECURE THE VENT TO THE WALL.
NOTE; A minlmtjm clearance of 1" to Com-
busNbles Is required.
4. Make remalnder of vent Instaltatlon per B•Vent
Inetallailan instructlo no,
FIGURE 3
COMPLETED INSTALLATION
1' MINIMUM
CLEARANCE
WALL
FROM
TO CENTER
OPENING
TEE BASL•
NAILED TO
I19ADER
40 VPTOR 60VITTEE
VAITHTEP- BASE
Mo OVAL o 0
PIPE
sonEW — I
4 OP BASE
PLATE
cPTIoNAL
OVAL To
ROUND
ADAPTER
4ePscElureG �
PLATE SPACER
OVALPIPE
IIEA7ERH PLATIrr o 4 LJP BASE
PLATE
WALL
RAAOKET
'--Mg0 EL001
MWT WALL
THIMBLE
ATSECONDANO
SUBSEQUENT CEILING
LEVELS. USE 4MOFS
` FIRESTOPSPACER
0
ATFIRB
LEVE USE41LINC-
0PS
CEILING PLATE
SPACER
USIN{1 OVAL FOR TERMINATION
I