Greenheck Fan Comprehensive Guide to G-098-VG Ventilation Hood Performance

Roof Downblast Exhaust

Belt & Direct Drive

GB-121 • G-123

243⁄8

(619)

			(Pa)
	*23	3⁄4
	(603)
			Pressure
43⁄8 (111)
			Static
13⁄4 (44)

19

(483)

Damper Size = 12 x 12 (305 x 305) Roof Opening = 141/2 x 141/2 (368 x 368) Shroud Thickness = 0.051 (1.3) Motor Cover Thickness = 0.040 (1.0) Curb Cap Thickness = 0.064 (1.6)

^Approximate Unit Weight G/GB = 58/66 lbs. (26/30 kg)

All dimensions in inches (millimeters).. *May be greater depending on motor. ^Weight shown is largest cataloged Open Drip-Proof motor.

RPM (Belt)

RPM (Direct)

RPM (Vari-Green)

HP

Density 0.075 lb/ft3

Density 1.2 kg/m3

wg)

E

(in.

U

R

V

C

M

Pressure

T

E

S

Y

S

I S

T

H

Static

F

O

F

T

E

L

E

H

T

O

T

T

C

E

L

E

S

T

O

N

DO

Volume (cfm)

Volume (m3/hr )

Direct Drive RPM
C-860 RPM	B-1140 RPM	A-1725 RPM	VG-1725 RPM

	Motor HP				Fan
Belt		Direct			RPM
121		123		580
		VG-		720
	1/2
			C-1/8	860

	0	0..125
CFM	704	515
BHP	0..02	0..02
Sones	3..2	3..3
CFM	873	735
BHP	0..03	0..04
Sones	4..2	4..3
CFM	1043	932
BHP	0..05	0..06
Sones	5..4	5..5

	Static Pressure in Inches wg
0..25	0..375	0..5	0..625		0..75	1	1..25	1..5
			MAXIMUM BHP AT A GIVEN RPM = (RPM/2170)3
					MAXIMUM RPM = 1725
523				TIP SPEED (ft/min) = RPM x 3.420
0..04				MAXIMUM MOTOR FRAME SIZE = 56
4..1

796580

0..06 0..06

5..2 5..2

1/4

1/3

VG -Vari-Green is a direct drive brushless DC motor.

1000

B-1/6 1140

1265

1395

1475

1550

CFM	1213	1119
BHP	0..08	0..09
Sones	6..7	6..8
CFM	1383	1300
BHP	0..12	0..13
Sones	8..4	8..4
CFM	1535	1460
BHP	0..16	0..17
Sones	10..2	10..1
CFM	1692	1625
BHP	0..21	0..23
Sones	12..5	12..4
CFM	1789	1726
BHP	0..25	0..27
Sones	13..5	13..4
CFM	1880	1820
BHP	0..29	0..31
Sones	14..6	14..5
CFM	1983	1926

1013	883	694
0..09	0..10	0..09
6..7	6..4	6..4
1213	1112	993	831
0..14	0..14	0..14	0..14
8..4	8..1	7..9	7..8
1384	1299	1204	1093	950
0..18	0..19	0..19	0..20	0..19
10..1	9..9	9..7	9..6	9..4
1557	1484	1404	1315	1214	907
0..24	0..25	0..26	0..26	0..26	0..24
12..3	12..2	12..0	11..7	11..5	11..3
1661	1594	1521	1441	1356	1132
0..28	0..29	0..30	0..31	0..31	0..31
13..3	13..2	13..0	12..7	12..4	12..0
1759	1696	1629	1555	1475	1289	974
0..32	0..33	0..34	0..35	0..36	0..36	0..33
14..3	14..2	14..0	13..8	13..5	12..9	12..4
1868	1810	1747	1680	1608	1446	1231

1635

1/2

A-1/2 1725

BHP	0..34	0..36
Sones	15..9	15..8
CFM	2093	2038
BHP	0..40	0..42
Sones	17..4	17..2

0..37	0..39	0..40	0..41	0..42	0..43	0..41
15..6	15..4	15..3	15..0	14..8	13..9	13..4
1984	1928	1871	1810	1743	1600	1426	1180
0..44	0..45	0..46	0..47	0..48	0..50	0..50	0..47
17..0	16..8	16..7	16..4	16..2	15..5	14..9	14..0

Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects of a birdscreen. The sound ratings shown are loudness values in hemispherical sones at 5 ft. (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values shown are for installation type A: free inlet hemispherical sone levels.

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