Nordson 107 041A, Manual, Page: 40 / 166

Installation
3-6
E
1996 Nordson Corporation
All rights reserved
107 041A
Issued 1/96
Manual 12-28
c. Calculate a pressure loss range for the blower selection.
NOTE: Since a blower can be damped down, use a pressure loss
that is rated between 25-mm (1.0-in.) of water column static
pressure higher than that calculated above.
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
Metric Units
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
US Units
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁ Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
PL(High) = 14.17 mm + 25 mm =
39.17-mm
ÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁ Á
ÁÁÁÁÁÁÁÁÁÁ
PL(High) = 0.55 in. + 1-in. =
1.55 in.
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
PL = 39.17 mm
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
PL = 1.55 in.
For the example, the exhaust blower should be rated at a static pressure
of at least 14.7 mm (0.55 in.) of water higher than that seen at a pitot
tube located at the exhaust duct center. However , when choosing a
blower, its a good idea to select one rated for a 12.7- to 25.4-mm (0.5- to
1.0-in.) static pressure higher than the valve calculated above.
Therefore, for this example, choose an exhaust blower capable of
delivering 17 cmm (600 cfm) of airflow at 44.45 m (1.75 in.) of static
pressure. From a known manufactures catalog, select a blower model
that meets or exceeds the calculated air flow requirements. That blower
must also
S
include a backward incline wheel.
S
have a single inlet.
S
mounted external to the blower.
S
be belt driven for easy repairs.
S
have the same power configuration as the oven.
Calculating the Exhaust Duct
Pressure Loss Range
(contd)
Choosing a Manufactures
Exhaust Blower Model