Alnor Airflow Proood PH730, Owner'S Manual, Page: 76 / 80

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Airflow™ Instruments ProHood Capture Hoods PH730/PH731
Performance Data
Performance data obtained in HVAC test laboratory using two high-accuracy flow stations as flow
measurement standards. The flow stations were mounted in sealed ductwork upstream of the tested
Swirl Diffusers.
-20
-10
0
10
20
30
40
0 100 200 300 400 500 600 700
M
ea
su
rem
en
t
Er
ro
r
[%
o
f
Fl
o
w
]
Flow [m
3
/hr]
PH731 Performance Data
(Swirl Diffuser on 200mm Dia. Duct)
PH731 with Swirl-X
PH731 (No Swirl-X)
PH731 Allowed Tolerance
-20
-10
0
10
20
30
40
0 200 400 600 800 1000 1200
M
ea
su
re
m
en
t E
rr
o
r
[%
o
f F
lo
w
]
Flow [m
3
/hr]
PH731 Performance Data
(Swirl Diffuser on 300mm Dia. Duct)
PH731 with Swirl-X
PH731 (no Swirl-X)
PH731 Allowed Tolerance