Greenheck Fan manual GB-540, Maximum BHP AT a Given RPM = RPM/202

Roof Downblast - Exhaust Belt Drive

GB-540

83

(2108)

*503⁄4	(Pa)
(1289)	Pressure
141⁄2 (368)	Static
13⁄4 (44)

64

(1626)

Damper Size = 54 x 54 (1371 x 1371) Roof Opening = 561/2 x 561/2 (1435 x 1435) Shroud Thickness = 0.100 (2.5)

Motor Cover Thickness = 0.064 (1.6) Curb Cap Thickness = 0.100 (2.5) ^Approximate Unit Weight = 748 lbs. (339 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

(in.wg)

R

V

E

Pressure

U

C

T

E

M

S

Y

S

I S

Static

T

H

F

O

T

F

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..5	0..75		1		1..25	1..5	1..75
540
		CFM	15488	1250
	175	BHP	0..61	0..65					MAXIMUM BHP AT A GIVEN RPM = (RPM/202)3
		Sones	6..9	6..3
											MAXIMUM RPM = 505
		CFM	17258	14674	11068
										TIP SPEED (ft/min) = RPM x 14.137
1	195	BHP	0..85	0..90	0..87
									MAXIMUM MOTOR FRAME SIZE = 256T
		Sones	7..8	7..5	7..2
		CFM	18143	15724	12632
	205	BHP	0..99	1..04	1..03
		Sones	8..3	8..2	8..1
		CFM	20798	18814	16229	12673
11⁄2	235	BHP	1..49	1..57	1..56	1..50
		Sones	10..1	10..4	10..5	10..6
		CFM	22922	21228	18963	16439
2	259	BHP	1..99	2..09	2..11	2..08
		Sones	12..3	12..1	11..9	11..6
		CFM	26197	24874	22870	20831	18610
3	296	BHP	2..97	3..11	3..14	3..13	3..10
		Sones	16..2	15..6	15..3	15..0	14..3
		CFM	31064	30005	28492	26810	25115	21376
5	351	BHP	4..96	5..13	5..21	5..24	5..23	5..15
		Sones	21	21	19..9	19..3	18..7	17..4
		CFM	35578	34653	33552	32075	30612	27519			24274
71⁄2	402	BHP	7..45	7..65	7..80	7..84	7..87	7..82			7..73
		Sones	27	26	26	25	24	23			21
		CFM	39118	38277	37435	36109	34766	32131			29134	26111
10	442	BHP	9..90	10..12	10..34	10..39	10..44	10..46			10..36	10..24
		Sones	32	32	32	32	32	28			27	26
		CFM	41950	41165	40381	39287	38034	35558			32927	30151	26271
	474	BHP	12..21	12..45	12..68	12..80	12..85	12..90			12..84	12..73	12..42
15		Sones	36	36	37	36	35	33			31	30	28
		CFM	44694	43957	43221	42332	41157	38813			36503	33869	31293	26758
	505	BHP	14..77	15..02	15..27	15..45	15..51	15..60			15..60	15..48	15..36	14..84
		Sones	40	40	40	40	39	38			36	35	32	30

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.

46