Whirlpool RH8930XLS manual Vertical Venting, Length

Page 4

Guidellne to Proper Duct Sizing for Ventllattng An Indoor Electric Grill

These Guidelines are to insure adequate ventilation for an indoor Electric Grrll. Indoor electric grtlls produce more smoke than normal cooking and requrres at least 410 CFM to provtde adequate ventrlation. Less strmgent ventilating requirements can devrate from these recommendattons.

HORtZONTAL VENTtNG

Figure two on page two shows a direct aischarge to the outside through a wall rain cap. Due to the lower CFM rating In thus venting posrtron, duct must be limrted la a maximum of 2 feet of 3% x 10 inch duct capped with a wall rain cap with a free discharge area of at least 66 inches square. There should be no bends in the connecting duct between the hood and the wall rain cap.

Figure 9shows an installation requiring more duct length. A transrtion to round is used as close to the hood as possible to eliminate the restriction caused by the 3% x 10 duct. 4S0 bends should be used instead of 90° bends wherever possrble.

VERTICAL

VENTING:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TABLE

I

 

 

 

 

 

Figure

one

on

page

 

two

shows

an

installation

 

using

3 feet

of

 

 

 

 

 

 

 

 

 

 

Vertical

Venttnq

 

 

 

 

 

3% x 10 inch duct

 

termrnating

In a roof rain cap. In table one we

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

see

that

3 feet of 3% x 10 inch duct is the maximum length of 3% x

 

 

 

 

 

 

 

 

 

 

10 inch

duct

 

recommended.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For example, if the straight lengths of duct In Fig 9 total 9 ft.

 

 

 

 

 

 

 

 

 

 

the elbow is 45O and the roof rain cap has 113 In2 free area,

 

 

 

 

 

 

 

 

 

 

choose

 

the

duct

size

required.

The

45O

elbow

can

be

 

 

 

 

 

 

 

 

 

 

approximated

 

by

dtvtding

the

equivalent

duct

lengths

 

In Table

2

 

 

 

 

 

 

 

 

 

 

by

two.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table I shows the maxrmum length of duct to be

Since

we already

 

have

9 ft. of

straight

 

duct,

Tdble 1 tells us

that

 

 

used In conjuncttan

with

a roof

ram

cap

having a

7” dia. is too small. So we try 8” dia.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

free area of 113 inz.

 

 

 

 

 

 

 

 

 

 

9

ft.

Straight

 

Duct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

ft.

Equivalent

straight

length of

4S0 elbow

(8”

Dia.)

 

 

 

TABLE

2

 

 

 

 

 

 

 

 

15

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Duct

 

 

 

 

 

 

 

Fifteen

 

feet

is over

the

maximum

of

13 ft. for

8”

dia.

duct,

so

8”

 

 

Equivalent

 

length

of

 

 

Size

strarght

duct

of

same

dia.

duck

is

too

small.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Move

to 9” dia.

duct

and

run

through

 

the

calculatrons

again.

 

7”

dia.

 

 

 

l*l

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

ft.

Straight

Duct,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0”

dia.

 

 

 

12

ft.

 

 

7

ft.

Equivalent

strarght

length

of 9”

dia.

duct

for

45O elbow.

 

900

9”

dia.

 

 

 

14

ft.

 

 

16

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10”

dia.

 

 

 

16

ft.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Elbow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sixteen feet is under the maximum of 25 ft. for 9” dia. duct, so 9”

 

 

 

 

 

 

 

 

 

 

duct is a good choice.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CFM

 

vs. DUCT

LENGTH

 

 

 

 

 

 

 

 

 

.25

 

 

355

26

 

61

 

104

.275

 

 

330

34

 

73

 

145

.30

 

 

250

65

136

 

 

.35

 

 

180

140

 

 

 

NOTE:

The

above

table is based on

vertical

discharge.

The values

rn this

table are for duct length only

and do

not

account

for static pressure loss

through

roof mounted

ram

caps.

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Page 3 Page 5
Contents Kitchen Range Hood Model RH8930XLS Motor Lights FilterC5mf FIG&EVertical Discharge Horizontal DischargeVertical Venting LengthTurn Decrease SpeedIncrease Speed UP ArrowBlower Cover Assy Cover MTG Cover Retaining ScrewsFive PIN Connector C Board Removal

RH8930XLS specifications

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