Greenheck Fan Explore the Greenheck GB Series Ventilation Hoods, Including Models GB-180, GB-220, and G-098-VG

Roof Downblast - Exhaust Belt Drive

GB-420

651⁄4

(1657)

*44
(1118)	Pressure(Pa)
93⁄4 (248)
13⁄4 (44)	Static

52

(1321)

Damper Size = 42 x 42 (1067 x 1067) Roof Opening = 441/2 x 441/2 (1130 x 1130) Shroud Thickness = 0.080 (2.0)

Motor Cover Thickness = 0.064 (1.6) Curb Cap Thickness = 0.100 (2.5) ^Approximate Unit Weight = 495 lbs. (225 kg)

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

RPM (Belt)

HP

Density 0.075 lb/ft3

Density 1.2 kg/m3

wg)

R

V

E

(in.

U

C

Pressure

S

T

E

Y

S

I S

T

H

Static

F

O

F

T

E

L

E

H

O

T

T

T

C

E

L

E

S

T

O

N

O

D

Volume (cfm x 1000)

Volume (m3/hr x 1000)

Motor	Fan					Static Pressure in Inches wg
HP	RPM		0	0..125	0..25	0..375	0..50	0..625		0..75		1..00	1..25	1..5
420
		CFM	8242	6454
	200
		BHP
1/2		Sones	3..1	2..9							MAXIMUM RPM = 600
		CFM	9890	8573	6365
										TIP SPEED (ft/min) = RPM x 11.061
	240	BHP	0..46	0..50	0..48
									MAXIMUM MOTOR FRAME SIZE = 215T
		Sones	4..6	5..0	4..9
		CFM	11332	10219	8698
3/4	275	BHP	0..69	0..75	0..76
		Sones	6..2	6..8	5..6
		CFM	12568	11579	10320	8672
1	305	BHP	0..95	1..01	1..03	1..01
		Sones	8..0	8..4	7..5	7..2
		CFM	14217	13357	12411	11102	9463
11⁄2	345	BHP	1..37	1..45	1..49	1..50	1..45
		Sones	11..7	11..3	10..8	10..1	9..6
		CFM	15659	14892	14043	12983	11787	10108
2	380	BHP	1..83	1..92	1..97	2..00	2..00	1..91
		Sones	14..4	13..8	13..3	12..7	12..3	12..0
		CFM	17925	17264	16540	15792	14790	13764			12502
3	435	BHP	2..74	2..86	2..93	2..97	2..99	3..00			2..95
		Sones	19..0	18..4	17..8	17..3	16..6	16..4			16..5
		CFM	19574	18968	18320	17640	16887	15929			14994	12315
	475	BHP	3..57	3..69	3..78	3..84	3..88	3..90			3..91	3..69
5		Sones	22	21	20	19..8	19..3	18..6			18..3	18..3
		CFM	21222	20663	20081	19459	18826	18046			17162	15254	12312
	515	BHP	4..55	4..68	4..80	4..87	4..92	4..95			4..98	4..92	4..56
		Sones	24	24	23	22	21	21			20	19..4	19..1
		CFM	22994	22478	21957	21383	20805	20219			19446	17835	15908
	558	BHP	5..79	5..93	6..07	6..15	6..22	6..28			6..31	6..34	6..21
71⁄2		Sones	27	27	26	25	24	24			23	23	22
		CFM	24725	24245	23765	23243	22709	22166			21621	20104	18585	16590
	600	BHP	7..20	7..35	7..51	7..61	7..70	7..76			7..81	7..87	7..86	7..64
		Sones	30	30	30	29	27	27			26	26	26	26

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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