Greenheck Fan manual GB-300HP, Maximum BHP AT a Given RPM = RPM/613

Roof Downblast - Exhaust Belt Drive

GB-300HP

50

(1270)

*36
(914)	Pressure(Pa)
81⁄4 (210)
13⁄4 (44)	Static

40

(1016)

Damper Size = 30 x 30 (762 x 762) Roof Opening = 321/2 x 321/2 (826 x 826) Shroud Thickness = 0.064 (1.6) Motor Cover Thickness = 0.051 (1.3) Curb Cap Thickness = 0.064 (1.6) ^Approximate Unit Weight = 320 lbs. (145 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

E

V

wg)

R

U

M

C

(in.

E

T

Pressure

S

S

Y

S

T

H

I

F

O

T

Static

F

E

L

E

H

T

O

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..5	0..75	1	1..25	1..5	1..75		2		2..25	2..5	2..75
300HP
		CFM	2912
	460	BHP	0..41						MAXIMUM BHP AT A GIVEN RPM = (RPM/613)3
		Sones	9..7
1/2											MAXIMUM RPM = 1065
		CFM	3602
										TIP SPEED (ft/min) = RPM x 7.985
	495	BHP	0..53						MAXIMUM MOTOR FRAME SIZE = 184T
		Sones	10..3
		CFM	4662	3600
3/4	565	BHP	0..77	0..76
		Sones	11..8	10..4
		CFM	5398	4652	3309
1	620	BHP	1..01	1..04	0..94
		Sones	13..4	12..3	10..6
		CFM	6542	5954	5269	4221
11⁄2	710	BHP	1..48	1..53	1..55	1..47
		Sones	17..2	16..0	15..3	13..4
		CFM	7013	6462	5889	5027
	748	BHP	1..71	1..78	1..81	1..78
2		Sones	18..8	17..5	17..0	15..7
		CFM	7460	6943	6402	5737	4800
	785	BHP	1..96	2..04	2..08	2..10	2..00
		Sones	20	19..1	18..5	17..9	16..2
		CFM	8107	7642	7146	6636	5922	4992
	840	BHP	2..37	2..46	2..52	2..57	2..56	2..43
3		Sones	23	22	21	21	19..7	18..0
		CFM	8746	8328	7870	7394	6892	6150			5245
	895	BHP	2..84	2..95	3..03	3..07	3..11	3..08			2..92
		Sones	25	24	23	23	23	22			19..8
		CFM	9722	9356	8951	8531	8094	7657			7029	6264	5222
	980	BHP	3..68	3..81	3..90	3..99	4..03	4..08			4..09	3..95	3..69
5		Sones	32	31	29	28	27	26			25	24	23
		CFM	10688	10351	10006	9621	9233	8831			8429	7903	7255	6543
	1065	BHP	4..67	4..81	4..94	5..04	5..12	5..17			5..23	5..24	5..17	5..01
		Sones	44	42	37	37	36	35			33	31	30	29

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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