Owner`s manual
7
Advance Planning
DUCT FITTINGS
Equivalent Quantity Total
Duct Piece Length* Used Length
10"round
to8"round 5ft.
Round, 1 ft.
straight (perfootlength)
8"Dia.17ft.
90°elbow 10"Dia.24ft.
8"Dia.10ft.
45°elbow 10"Dia.14ft.
Round 8"Dia.32ft.
wallcap 10"Dia.41ft.
with damper
Round 8"Dia.44ft.
roofcap 10"Dia.56ft.
Usethischarttocomputemaximum
permissable lengths for duct runs to
outdoors.
Forbestresults,use10"diameterduct.
Note: Do not exceed maximum permissable
equivalent lengths!
Maximum recommended duct
length for these hoods: 150 feet
Flexible ducting:
Ifexiblemetalductingisused,all
the equivalent feet values in the table
shouldbedoubled.Theexiblemetal
duct should be straight and smooth
andextendedasmuchaspossible.
DoNOTuseexibleplasticducting.Note:
Any home ventilation system, such as a ventilation
hood, may interrupt the proper ow of combustion
air and exhaust required by replaces,
gas furnaces, gas water heaters and other natu-
rally vented systems. To minimize the chance of in-
terruption of such naturally vented systems, follow
the heating equipment manufacturer’s guidelines
and safety standards such as those published by
NFPA and ASHRAE.
TotalDuctRun
Hoods Are Equipped
For 10" Round Duct
*Hoodsaresuppliedwitha10"round
transition. A locally
supplied transition is required
for other sizes.
Note: Outlet on top of hood is
8-1/8"x8".
*Actual length of straight duct plus duct
ttingequivalent.Equivalentlengthofductpieces
are based on actual tests conducted
byGEEvaluationEngineeringandreectrequire-
ments for good venting performance with any
ventilation hood.