Page 18
TMC-647-(Rev E) - 01/06
MOORE FANS LLC, Marceline, MO 64658 Phone (660 ) 376-3575 FAX (660) 376-2909
In this rather common wind condition, then, it can be
seen that the blade load on the side where the blade is going
against the wind will be double the load on the side where
the blade is going with the wind. In a 40 mile per hour wind,
the blade load would vary by a factor greater than 4. In a 60
mile per hour wind, the load would vary by a factor of more
than 10! It is obvious that operation under such conditions
will impose tremendous repetitive loadings on the fan
blades.
In areas of unusually high wind velocities, it may be
advisable to shield the fan in some manner.
4.5.3 OBSTRUCTIONS
Obstructions of one type or another in the air stream,
ahead of or beind the fan, are to be expected. In fact, it would
be virtually impossible to eliminate all obstructions. Struc-
tural supporting members, foundations and the like, need
not be of serious concern although all obstructions, even
small ones, will increase the static pressure and must be
taken into consideration by the system designer in specify-
ing the fan performance.
The total free area from which the fan can draw air
should be at the least twice the net area of the fan (fan area
minus hub area). In other words, the air approaching the
inlet of the fan should have no more than half the velocity
of the air passing through the fan. This area should be
distributed reasonably uniformly. It would be unwise to
attempt to operate a fan with one-half or one-third of the fan
area completely blanked off. Such a condition would cause
stalling of the fan blade through one-half the revolution but
create a condition of overload in the half which was not
blocked off. Excessive vibration would result. Any condi-
tion which forces the air to approach the fan in a non-axial
direction should be avoided.
4.5.4 UNEVEN TIP CLEARANCE
Where fan rings are out of round or not centered with
the fan, the tip clearance of each blade will vary as it makes
a revolution. If tip clearance is tight at one point and
excessive at another, proper flow will establish itself at the
tight point, loading the blade to the very tip, while at the
loose point the air will flow from the high pressure side of
the blade through the opening between the blade tip and the
ring and nullify the negative pressure on the under side of
the blade. This will unload the blade near the tip within the
area of excessive tip clearance. Under this condition, the
blade will load and unload near the tip one or more times
per revolution, resulting in an undesirable repetitive vibra-
tion. Every effort should be made to keep the tip clearance
to a minimum and to have this clearance as constant as
possible around the entire throat.
The drawings which follow illustrate Moore Class
5400 Fans and identify all field-replaceable parts for these
units. Sheet 1.1 Fan Specifications included in the envelope
shipped with your order will help you identify the drawing
applicable to your fan(s). On this sheet, under the heading
"Assembly Data", the portion of the fan model number that
identifies hub type is shown as "Arrangement:". The four
drawings and parts lists which follow are described in the
column at right.
The Moore Company keeps permanent records of all
fans of its manufacture, indexed by serial and job numbers
and by the owner, if the Owner's Registration has been
returned. The Company will be happy to assist you if you
have questions regarding spare parts or replacements.
6.1 AUTOMATIC FANS: SERIES 33-60, 3-8 BLADES
For all automatic fans whose hub arrangement desig-
nation does NOT contain the letter "J".
6.2 AUTOMATIC FANS: SERIES 49-73, 9-12 BLADES
For automatic fans whose arrangement designation
includes the letter "J". These fans have an extended hub
centerline-to-base dimension used on some Series 49 and
Series 60 fans and on all Series 73 fans.
6.3 MANUAL FANS - For all manual fans except Series 19
6.4 SERIES 19 FANS - For all Series 19 fans
6.0 DRAWINGS AND PARTS LISTS
MOORE FANS LLC (the Seller) warrants only to Buyer, as
its purchaser for resale, that the fans manufactured and sold by
Seller to Buyer under this Agreement will be free from all defects
in material and workmanship under ordinary use for a period of
two (2) years from the date of shipment or one (1) year from the
date the fan is installed on a customer's premises, whichever
occurs first. This warranty period shall apply only if Seller
receives written notice of any defect within the warranty period.
Upon receipt of such notice, Seller, at its option, may require
Buyer to return the fan at Buyer's cost to Seller for inspection by
Seller. If the fan is found to be defective on inspection by Seller,
as a sole and exclusive remedy, Seller will, at its option, either
repair or replace the fan. This warranty shall not apply to
damage on account of misuse, neglect or accident or
shipping damage, or if repairs or part replacements have
been made or attempted without Seller's prior written
authorization. S
ELLER SHALL NOT BE LIABLE IN ANY EVENT FOR
ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS
OR
ANY WARRANTY. THIS WARRANTY IS IN LIEU OF ALL OTHER
GUARANTEES
OR EXPRESSED WARRANTIES AND ALL IMPLIED WAR-
RANTIES, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABIL-
ITY AND OF FITNESS FOR A PARTICULAR PURPOSE. DUE TO THE
VARIETY
OF CONDITIONS UNDER WHICH THE FANS MAY BE USED,
RISKS OF RESULTS OBTAINED FROM USE OF THE FANS, WHETHER USED
ALONE
OR IN COMBINATION WITH OTHER PRODUCTS, IS ENTIRELY
BUYER
'S. THE ABOVE LIMITATIONS ON DAMAGE AND EXCLUSION OR
LIMITATION
OF IMPLIED WARRANTIES ARE NOT APPLICABLE TO THE
EXTENT
PROHIBITED BY STATE LAW.
5.0 WARRANTY
OPERATION
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