9G1248H4021 SANYO DENKI - SANACE FANS, 9G1248H4021 Datasheet - Page 10

• Manufacturer Part Number: 9G1248H4021
• Description: AXIAL FAN, 120MM, 48VDC, 100mA
• Manufacturer: SANYO DENKI - SANACE FANS

Specifications of 9G1248H4021

• External Height: 120mm
• External Width: 120mm
• External Depth: 25mm
• Current Type: DC
• Supply Voltage: 48VDC
• Flow Rate: 88CFM
• Noise Rating: 40dBA
• Power Connection Type: Lead Wires
• Bearing Type: Ball
• Flow Rate - Imperial: 88CFM
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TECHNICAL MATERIAL
Characteristics calculation procedure
and description
It is very difficult to measure air flow and static pressure. In
fact, the performance curve may vary greatly according to the
type of measuring equiment.
The commonly-used type of measuring equipment is a wind
tunnel using a Pitot tube. Sanyo Denki uses a very precise
method using double chamber equipped with many nozzles.
Static pressure
1mm H
1mm H
1inch H
1Pa＝0.102mm H
1inch H
8
Measuring air flow and static pressure
Conversion Table
U-shaped tube
Ps
2
2
2
2
O＝0.0394inch H
O＝9.8Pa（Pascal）
O＝25.4mm H
O＝249Pa
Double chamber measuring equipment
Chamber A
2
O
2
O
Pn
2
O
Fan to be measured
U-shaped tube
Nozzle
Chamber B
Auxiliary blower
Throttle device
BM
Q＝60A ¯
where
Q = air flow（m
A = cross sectional area of nozzle＝−
D = nozzle diameter
γ : Air specific gravity（kg/m
g = acceleration of gravity = 9.8（m/sec
Pn = differential pressure（mm H
Ps = static pressure（mm H
The measuring equipment using double chanber is method to be
calculated from air flow goes through nozzle and differential pres-
sure between pressure of inside of chamber (Ps) and atomos-
pheric pressure by measuring differetial pressure between air
intake and exhaust of nozzle (Ph).
Air flow
1m
1CFM＝0.0283m
1m
1CFM＝0.472R/sec
1R/sec＝0.06m
¯ v = average air flow velocity of nozzle＝ 2g ─
（γ＝1.2kg/m
3
3
/min＝35.31ft
/min＝16.67R/sec
v（A）
3
3
/min）
/min
3
3
/min
3
/min（CFM）
at 20℃, 1 atmospheric pressure）
2
O）
3
）
2
O）
4
π
D
（m
2
2
）
2
）
Pn
γ
（m/sec）