GE Monogram ZV1050 Installation Instructions Manual page 6

Advance Plannin
Use this chart to compute maximum
permissible lengths for duct runs to
otltdooI's.
Note: Do not exceed maximum ?ermissible
equivalent lengths!
Maximum duct length:
100ft. for range hoods.
Flexible ducting:
If flexible metal ducfing is used, all
the equivalent feet values in the table
should be doubled. The flexible metal
duct should be straight and smooth
and extended as much as possible.
Duct Piece
Dimensions
Round,
straight
3-1/4" x 12"
straight
90 ° elboB 17 ft.
(_ 45 ° elb(m I 0 ft.
3-1/4" x 12"
90 ° elbo_ 43 ft.
3-1/4" x 12"
45 ° elb{}_ 26 ft.
3-1/4" x 12"
90 ° fiat elboB 102 it.
Total
Equivalent Quantity Equivalent
Length* Used Length
(per toot
length)
(per toot
length)
Do NOT use flexible plastic ducfing.
Note: Any homeventilation system,suchasa ventilation
hood,may interruptthe properflow of combustionair and
exhaustrequiredbyfireplaces,gas furnaces,gas water
heatersandother naturallyvented systems.To minimize
the chanceof interruption of such naturallyvented
systems,follow the heatingequipmentmanufacturer's
guidelinesandsafety standardssuchasthose published
byNFPAandASHRAE
Q 8" round to
3-1/4" x 12" transition 2 It.
_lt, 3-1/4" x 12"
to 8" round transition 5 it.
_ 8" I'Ot/lld
to 3-1/4" x 12"
transiti(}n 90 ° elb(m 6 ft.
_ 3-1/4" x 12" to 8" 3 "
r(}und transiti(}n 90 ° elb(m 1: ft.
_%allcap
s_ith damper
32 ft.
3-1/4" x 12" Ball cap
Bith 75 ft.
dan}per
Round
roof cap
44 it.
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are based
on actualtests conductedby GEEvaluationEngineering
and reflectrequirementsfor good venting performance
with any ventilation hood.
Total Duct Run