Greenheck Fan manual GB-480, Maximum BHP AT a Given RPM = RPM/245

Roof Downblast - Exhaust Belt Drive

GB-480

733⁄4

(1873)

*471⁄4

(1200)

111⁄4 (286)

13⁄4 (44)

58

(1473)

Damper Size = 48 x 48 (1219 x 1219) Roof Opening = 501/2 x 501/2 (1283 x 1283) Shroud Thickness = 0.080 (2.0)

Motor Cover Thickness = 0.064 (1.6) Curb Cap Thickness = 0.100 (2.5) ^Approximate Unit Weight = 623 lbs. (283 kg)

Static Pressure (Pa)

RPM (Belt)

HP

Density 0.075 lb/ft3

Density 1.2 kg/m3

wg)

E

(in.

U

R

V

C

Pressure

M

T

E

S

Y

S

S

I

H

Static

F

T

O

F

T

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)

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

Motor	Fan					Static Pressure in Inches wg
HP	RPM		0	0..125	0..25	0..375	0..5	0..625		0..75		0..875	1	1..25
480
		CFM	12020	10059	6529
1/2	200	BHP	0..51	0..55	0..48				MAXIMUM BHP AT A GIVEN RPM = (RPM/245)3
		Sones	7..3	6..6	7..3
											MAXIMUM RPM = 485
		CFM	13522	11811	9500
										TIP SPEED (ft/min) = RPM x 12.632
3/4	225	BHP	0..73	0..77	0..76				MAXIMUM MOTOR FRAME SIZE = 215T
		Sones	8..3	8..0	7..6
		CFM	15025	13516	11662	8820
1	250	BHP	1..00	1..05	1..06	0..98
		Sones	9..5	9..5	8..6	8..1
		CFM	17129	15830	14379	12517	9587
11⁄2	285	BHP	1..48	1..54	1..58	1..56	1..42
		Sones	11..8	11..2	10..7	10..0	9..1
		CFM	18631	17437	16135	14589	12656
2	310	BHP	1..90	1..97	2..02	2..02	1..97
		Sones	14..0	13..0	12..2	12..0	11..5
		CFM	21636	20608	19548	18385	17010	15420			13507
3	360	BHP	2..98	3..06	3..13	3..17	3..17	3..21			3..00
		Sones	17..6	17..0	16..4	15..9	15..5	15..0			14..2
		CFM	23619	22678	21736	20683	19605	18254			16764	15086
	393	BHP	3..87	3..66	4..05	4..10	4..14	4..12			4..06	3..94
		Sones	20	19..9	19..5	18..8	18..3	18..0			17..5	16..7
		CFM	24942	24050	23158	22189	21181	20012			18733	17211	15486
5	415	BHP	4..56	4..65	4..75	4..81	4..85	4..86			4..84	4..74	4..58
		Sones	22	22	22	21	21	20			20	19..1	18..1
		CFM	25542	24672	23801	22868	21883	20799			19550	18156	16604
	425	BHP	4..90	4..99	5..09	5..16	5..20	5..22			5..20	5..13	5..00
		Sones	23	23	23	22	22	21			21	20	19..3
		CFM	27345	26532	25719	24886	23966	23046			21953	20786	19471	15870
	455	BHP	6..01	6..11	6..22	6..31	6..36	6..41			6..41	6..38	6..30	5..85
71⁄2		Sones	27	27	27	26	26	25			25	24	24	21
		CFM	29149	28386	27623	26860	26016	25153			24290	23201	22106	19517
	485	BHP	7..28	7..39	7..50	7..61	7..67	7..72			7..78	7..75	7..73	7..49
		Sones	31	31	31	31	30	29			29	28	28	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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