Whirlpool RGH 8300-2, RGH 8300-1 manual Camper Blade, Horizontal Venting, Vertical Venting

-CAMPER BLADE

	\	TO FRONT
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FIGURE 5 FIGURE 6

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Guideline to Proper Duct Sizing for Ventilating An Indoor Electric Grill

These Guidelines are to insure adequate ventilation for an indoor Electric Grill. Indoor electnc grills produce more smoke than normal cooking and requtres at least 41 OCFM to provide adequate ventllatton. Less sinngent venttlating requtrements can deviate from these recommendations.

HORIZONTAL VENTING:

Frgure 2 on page 1 shows a direct discharge to the outside through a wall rain cap. Due to the lower CFM rating in this venting posItron. duct must be limtted to a maximum of 2 feet of 3;/r x 10 Inch duct capped with a wall rain cap with a free discharge area of al least 66 inches square. There should be no bends in the connec:lng duct between the hood and the wall ratn cap.

VERTICAL VENTING:

Figure 1 on page 1 shows an installation using 3 feet of 3% x 10 inch duct term:nating in a roof rain cap. In table 1 we see that 3 feet of 3:. x 10 inch duct is the maxlmum lengtn of 3’;; x 10 Inch duct recommended.

Figure 7 shcws an installation requiring more duct length. A transr!lon to round is used as close to the hood as possible to elrmtnate the restriction caused by the 3’; x 10 duct. 4jJ bends should be used Instead of 90g bends wherever possible.

For example, if the straight lengihs of duct In FIN. 7 total 9 ft. the elbow IS 45’ and the roof rain cap has 113 in’ free area. choose the duct size required. The -15; elbow can be approximated by dividing the equivalent duct !engths In Table 2 by two.

Since we already have9 ft. of straight duct, Table 1 tells us that 7” dia. IS too small. So we try 8” dia.

9 ft. Straight Duct

6Equrvalent straight length of 4.Y elbow (8” Dia.)

15ft.

Frfteen feet is ever the maximum of 13 ft. for 8” dia. duct, so 8” duct IS to small.

!-dove to 9” dia. duct and run :hrough the calculations again.

9 ft. Straight Duct.

7 ft. Equrvalent stratght leng!h cf 9” dia. duct for 45” elbow. i-6-K

Sixteen fee! IS under the maxrmum of 25 ft. for 9” dia. duct, so 9” duct IS a gocd chotce.

		TABLE		I
		Vertical	Venting
I	Duct	I 3’/. x 10” I 7”	dm	I 8” dia.	I 9” dia.	1 10” dia. 1
	Size
	,uax
	Duct
	Length	3	7.	13	25	40
	(Feet)

Table 1 shows the maxlmum length of duct to be used In COnjunct;on wltn a roof rain cap i-,avlng a free area of 113 II-I?.

					TABLE 2
			Duct		Equivalent	length	of
.			Size		straight ducr of same		dia.
					11	ft.
	--	l			12	ft.
			9”	dia.	14	ft.
	90”
.			10”	dta.	:6	ft.
	Elbow

FIGURE 7

CFM vs. DUCT LENGTH FOR F?GH SERIES HOOD Equivalent Duct Length (ft.)

Static	/	cFh4	j 3-;;t:0		/	7” dia.	1	8” dia.	1	9” dia.1
Pressure
	I						L		I		4
.06		460		4		8.5		17	~~~:
			I		i					30	i
.lO		440		7		16.0		31		55.5	1
.15		417		12		25.0		50
.20	/	390	/	18	1	40	1	77	/	142!
.25		355
		330
							I
.30		250		65	1	1361				-I
.35		180		?40	i	.;

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NOTE: Tne above table IS basec on-~ertlcal disc IT&?. Thevaiues In lhls !able are for duct length only and co not account for Sldtic pressure loss :hroucn roof mounted rain c. 0s