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TMLE 1
CalculateTotalEquhalentDu-ork Len@h
EquivalentNumber
EquNalent
)uct Pieces Length*x Used
= Length
5“ round
D
;:::;d
2.7 X ( R.)i=
ft
straight
1
x ( fi.)t=
fi
\
3X” x 1
o“
str~ght
1
x ( fi.)t=
ft
Q
5“, No
elbow
37 fi. x( )= ft
6“,%0
elbow
15 fi. x (
)=
fi
a
5“,45”
elbow
18 fi. x( )=
ft
6“,45”
elbow
9fi. x( )= ft
Flexible
MetalOffset (14
ti. perinch)x
Adapter
(—
in. offset) =
ft.
@
3WX1O”
90°elbow
16fi. x( )= ft
@
3WX1O”
45°elbow
5fi. x( )= fi
Q
3TX1O”
W“ flatelbow
18fi. x( )=
ft
5“ round
%
to 3B” x 1o“
transition
3fi. x( )=
ft
6“ round
to 3%”x 1
o“
transition
7ti. x (
)=
R
SubtotalColumn1 = ft
*
Equivalentlengthsofductpiecesare based
onactualtes~ andreflectrequirementsforgood
ventingperformancewithanydowndraftcooktop.
~Measureandfistfeetofstraightductused.
Countandtistthe quantityofd other duct
piecesforthe “NumberUsed”ofeachtype.
IMWRTMT
Formaximumefficiency,use the shortest and
straightestductrun possible,withas fewfittings
as possible.
Forsatisfactoryperformance,
theductrunshodd notexceed60 feet
qtient len~.
Ventingperformanceis improvedby using
largerdiameterducL
EquivalentNumber Equivalent
)uct Pieces Length*x Used = Length
5“ round
to 35” x
10”
transition
Q
90°elbow
37 fi. x( )= R.
6“ round
to 3%”x lo”
transition
90°elbow
2ofi. x( )=
ft.
a
3%”x 1o“
to 6“ round
transition
5fi. x (
)=
ft.
%
3%”x 1o“
to 6“ round
transition
90°elbow
12 fi. x( )=
ft.
m
Tapered
5“ round
.
to 6“ round
transtion
6fi. X( )= ft.
&
5“ roundcollar
to 6“ round
captransition
13fi. x( )=
R.
5“ round
D
wallcap
withdamper
84 fi. x( )= ft.
6“ round
?; 7&per
21ti. x( )= ft!
=
3%”x 1o“
wdl cap
withdamper
27 fi. x( )= ft.
9
6“ round
roofcap
20X()= ft.
e
6“ round
roofvent
24x()= ft.
SubtotalColumn2 = ft.
SubtotalColumn1 = ft.
TOTALDUCWORK=
ft.
Should not exceed60 feet.
H
flexiblemeti ductingis used,d the equivalent
feetvaluesinthetableshouldbe doubled.me
flexiblemeti ductshouldbe straightandsmooth
andextendedasmuchaspossible.
DO N~ usefitible plasticduc~.
Ventins~ation shouldnotexceed60feet
equivalentlength.
Bloweris ratedat300 Cm at 0.1inchofwater
backpressure.
I
50