
Read and Save These Instructions
FORM 613114
INSTALLATION & ASSEMBLY INSTRUCTIONS
Grease Trough and Curb Hinge Assemble For
Models PNU, PDU, USNU, and USDU
RECEIVING AND INSPECTION
Immediately upon receipt of a shipment, carefully 
inspect for damage and shortage. If any damage 
and/or shortage is detected or suspected the carrier 
must be asked to conduct an inspection. The 
consignee’s representative should not accept 
shipment without a notation on the delivery receipt 
indicating items not delivered or apparent extent of 
damage.
When a shipment is opened and damage is found 
which was not evident externally (concealed damage), 
it is mandatory that the consignee request an 
immediate inspection by the carrier. Report damage to 
the carrier within 15 days. Failure to report damage 
within the above time limit will cause rejection of a 
claim.
HANDLING
When handling fans and their accessories, always 
use equipment and methods that will not cause 
damage. Fans should be lifted using slings and 
padding or spreaders to avoid damage.
CAUTION! Always make sure that all lifting and 
handling equipment and techniques conform to 
current safety standards.
Avoid lifting fans in a way that will bend or distort fan 
parts. Never pass slings or timbersthrough the orifices 
of fan.
CAUTION! Do not lift by the fan hood. Fans with 
special coatings or paints must be protected in 
handling to prevent damage.
STORAGE
Fans are protected against damage during shipment. 
If they cannot be installed and put into operation 
immediately upon receipt certain precautions are 
necessary to prevent deterioration during storage. 
Responsibility for integrity of fans and accessories 
during storage must be assumed by the user. The 
manufacturer will not be responsible for damage 
during storage. These suggestions are provided 
solely as a convenience to the user, who shall make 
his own decision as to whether to use any or all of 
them.
temperature swings may cause condensation and 
"sweating" of metal parts). Windows should be 
covered to prevent temperature variations caused by 
sunlight. Provide thermometers and humidity 
indicators at several points and maintain the 
atmosphere at 40% relative humidity, or lower.
It may be necessary to use trays of renewable 
desiccant or portable dehumidifier to remove moisture 
from the air in the storage enclosure.
Thermostatically controlled portable heaters (vented 
to outdoors) may be required to maintain even 
temperatures inside the enclosure.
CAUTION! Provide fire extinguishers, or fire alarms, 
or telephone to protect building and equipment against 
fire damage. Be sure that building and storage 
practices meet all local, state and federal fire and 
safety codes.
The following fans or accessories must be stored 
indoors, in a clean dry atmosphere:
a. Propeller Wall Fans not in Wall Housings. 
b. Any fan which is protected by a cardboard
carton. 
c. Motors dismounted from fans. 
d. Spare wheels or propellers. 
e. The belts, sheaves, bushings and other parts
when not mounted on fan. 
f. Boxes, bags or cartons of hardware. 
g. Curbs 
h. Shutters
Remove any accumulations of dirt, water, ice or snow 
and wipe dry before moving indoor storage. Allow cold 
parts to reach room temperature to avoid “sweating” of 
metal parts. Open boxes or cartons. Remove any 
accumulated moisture; if necessary use portable 
electric heaters to dry parts and packages. Leave 
coverings loose to permit air circulation and to permit 
periodic inspection.
Rotate wheels or propellers by hand to distribute 
bearing grease over the entire bearing surfaces.
Store at least 3 ½” off the floor on wood blocks covered 
with moisture proof paper or polyethylene sheathing. 
Provide aisles between parts and along all walls, to 
permit air circulation and space for inspection.
INDOOR: The ideal storage environment for fans and 
accessories is indoors, above grade, in a low humidity 
atmosphere which is sealed to prevent the entry of 
blowing dust, rain, or snow. Temperatures should be 
evenly maintained at between 70°F and 105°F (wide
OUTDOOR: Fans designed for outdoor use may be 
stored outdoors, if absolutely necessary. The storage 
area should bereasonably level and drained or ditched 
to prevent accumulation of water. Fencing and lighting 
for security are desirable. Roads or aisles for portable
 

cranes and hauling equipment are needed. Consider 
the use of drift fencing to minimize accumulation of 
blowing snow or dirt.
The following fans may be stored outdoors, if dry 
indoor storage space is not available:
a. Fans intended for outdoor use that are crated
in wood.
b. Wall fans where installed in wall housings.
All fans must be supported on wooden blocks or 
timbers above water or normal snow levels. Provide 
enough blocking to prevent settling into soft ground. 
Fans should be set in place using the directional arrow 
markings on the crate as a guide.
Locate pieces far enough apart to permit air 
circulation, sunlight, and space for periodic 
inspection. Place all parts on their supports so that 
rain water will run off, or to minimize water 
accumulation. Do not cover parts with plastic film or 
tarps-these cause condensation of moisture from the 
air passing through heating and cooling cycles.
Fan wheels and propellers should be blocked to 
prevent spinning caused by strong winds.
INSPECTION AND MAINTENANCE DURING
STORAGE
Inspect fans and accessories at least once per month, 
while in storage. Log results of inspection and 
maintenance performed. A typical log entry should 
include the following:
a. Date 
b. Inspector’s Name 
c. Name of Fan 
d. Location 
e. Condition of Paint or Coating 
f. Is moisture present? 
g. Is dirt accumulated? 
h. Corrective steps taken?
If moisture or dirt accumulations are found on parts, 
the source should be located and eliminated. Fans 
should be rotated at each inspection by hand ten to 
fifteen revolutions to redistribute the motor and 
bearing lubricant.
If paint deterioration begins, consideration should be 
given to touch-up or repainting. Fans with special 
coatings may require special techniques for touch-up 
or repair.
Company) or equal. For hard to reach internal 
surfaces or for occasional use, consider using Tectly 
511M Rust Preventive or WD40 or equal.
REMOVING FROM STORAGE
As fans are removed from storage to be installed in 
their final location, they should be protected and 
maintained in similar fashion, until the fan equipment 
goes into operation.
GREASE TROUGH INSTALLATION (Roof Fan)
1. Place grease trough assembly in position on curb 
as shown in Figure A. The hole in the center of the 
grease trough top should be directly under the 
downspout. Mark the position of the two key holes 
in the grease trough top on the fan curbcap or on 
the roof curb depending on the desired location.
Figure A
5
2. Drill
" (8 mm) holes at the locations marked on
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the curbcap or roof curb.
3. Thread the speed nut up to within 
head of the
1
4
-20x
3
“ round head machine screw
4
and insert into the hole. Thread the standard
1
" (6 mm) of the
4
1
nut onto the screw on the inside of the curb and 
tighten.
4. Install the grease trough and its top on these two 
screws as shown in Figure B.
"
4
Machined parts coated with rust preventive should be 
restored to good condition promptly if signs of rust 
occur. The most critical items are pulleys, shafts and 
bearing locking collars. At the first sign of rusting on 
any of the above parts, remove the original rust 
preventive coating with petroleum solvent and clean 
lint-free cloths. Polish any remaining rust from 
surfaces with crocus cloth or fine emery paper and oil. 
Do not destroy the continuity of the surfaces. Wipe 
clean with lint-free cloths and recoat surfaces evenly 
and thoroughly with Tectly 506 (Ashland Oil
Figure B
Page 2
 

GREASE TROUGH INSTALLATION (Wall Fan)
1. The grease trough should line up just below the 
windband lip as shown in Figure C. It should be 
centered below the fan when viewed from the 
outlet side of the fan.
Figure C
2. Attach grease trough bracket supports to fan 
windband.
operation, the grease level must be kept above the 
bottom of the baffle plate which separates the 
chambers. If your operation produces a lot of grease,
1
then
" (32 mm) of water in the bottom of the
1
4
grease trough should keep the grease from 
overflowing until you clean the trough. If you are in an
arid area and produce little grease, then 2" (51 mm) to 
3" (76 mm) of water may be required.
Frequent inspections should be made of the grease 
trough until you can determine the level of water to be 
used and the frequency of cleaning. To begin, fill the
trough with 2" (51 mm) of water just before start up 
and check the trough the next morning.
TYPE A - CURB HINGE INSTALLATION
1. Attach the pivot bolt to the fan curb and orifice 
section in the holes provided as shown in Figure E
5
1
x
using one
inch bolt and nut per side. Place
1
16
4
the bolt head to the outside.
3. Attach grease trough bracket between supports 
using supplied bolts as shown in Figure D.
Figure D
4. Drill four (4) holes in the fan windband. Loosely 
assemble all parts. Position grease trough and 
mark holes of grease trough bracket. Mount to fan 
with supplied hardware.
5. Tighten two supplied
1
" bolts into the grease
4
trough bracket so that the grease trough and 
grease trough lid may be hung on the bolt heads.
GREASE TROUGH NOTE (Roof and Wall)
This grease trough has been designed with two 
chambers. One for collecting grease and the other for 
an escape channel for rain water. For proper
Figure E
2. With the fan mounted on the curb, position the 
hinge brackets on the curb as shown in Figure F 
and mark the holes.
Figure F
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3. Drill
" (6 mm) holes at the location marked on the
4
curb.
4. Attach the hinge brackets to the curb using
1
x
4
inch bolts and nuts provided. Place the bolt head to
1
the outside. (Alternate method:
" pop rivets may
4
also be used.)
3
4
Page 3
 

ACCEPTANCE All orders and sales are subject to 
written approval and acceptance by an executive offi 
cer of the Company at Muskogee, Oklahoma, and are 
not binding on the Company until so approved.
DELIVERY All shipping and delivery dates are esti 
mated only. No delays in delivery will subject the 
Company to any costs, damages or fees for late deliv 
ery. Delivery of the products herein specified shall be 
made F.O.B. point of shipment, unless otherwise 
stated. The Company shall not be liable for delay due 
to causes beyond its reasonable control, such as Acts 
of God, acts of the purchaser, acts of civil or military 
authorities, priorities, fires, strikes, floods, epidemics, 
war, riots, delays in transportation, car shortages, and 
inability, due to reasons beyond its reasonable control, 
to obtain necessary labor, material, or manufacturing 
facilities. In the event of such a delay, the date of deliv 
ery shall be extended for a period equal to the time lost 
by reason of the delay.
TERMS OF PAYMENT If, in the judgment of the Com 
pany, the financial condition of the purchaser at any 
time does not justify continuation of manufacture or 
shipment on the terms of payment specified, the Com 
pany may require full or partial payment in advance.
Pro rata payments shall become due as shipments are 
made. Each shipment or delivery shall constitute a 
separate sale, and the default of any shipment or deliv 
ery shall constitute a separate sale, and the default of 
any shipment or delivery shall not vitiate the contract 
as to other shipments or deliveries.
SALES AND SIMILAR TAXES The Company’s prices 
do not include sales, use, excise, or similar taxes. 
Consequently, in addition to the price specified herein, 
the amount of any present or future sales, use, excise, 
or other similar tax applicable to the sale of the product 
herein shall be paid by the Purchaser, or in lieu thereof
TERMS AND CONDITIONS OF SALE
the Purchaser shall provide the Company with a tax 
exemption certificate acceptable to the taxing authori
ties.
CANCELLATION Any contract resulting from the Pur 
chaser’s order may be canceled by the Purchaser only
by negotiations and upon payments of reasonable can
cellation charges which will take into account expenses
already incurred and commitments made by the Com
pany.
DESIGN CHANGES The Company reserves the right 
to make changes in design, improvements and addi 
tions in and to its products any time without imposing 
any liability or obligations to itself to apply or install the 
same in any product manufactured by it.
TITLE The title and right of possession of the products
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sold herein shall remain with the Company and such 
products shall remain personal property until all 
payments herein (including deferred payments whether 
evidenced by notes or otherwise) shall have been
made in full in cash and the Purchaser agrees to do all
acts necessary to perfect and maintain such right and 
title in the Company.
PRICE ADJUSTMENTS Prices are subject to change 
upon notice by the Company. Prices on existing or 
ders are subject to surcharges in the event of cost in 
creases of metals and transportation. All complete
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component accessory material manufactured by others 
and furnished with the Company’s products such as 
motors, drives, vibration equipment, controls or other 
completely assembled component structures, are sub 
ject to adjustment to the price at time of shipment re 
gardless of the date of original order entry.
SAFETY ACCESSORIES The Company manufactures 
products designed to serve multiple applications and 
offers a wide range of safety equipment, including 
guards and other devices, as may be required to meet
customer specifications. Without exception, the Com
pany recommends that all orders include applicable
safety devices. Products ordered without applicable 
safety devices is clearly the responsibility of the Pur
chaser. Further, the Purchaser warrants that it has de
termined and acquired any and all safety devices re
quired for products sold by the Company. Weather
covers and guards for motor and V-belt drives, cou
plings, shafts and bearings, along with inlet and outlet
screens, are optional accessories noted in the price 
list.
GOVERNING LAW The rights, obligations and reme
dies of Purchaser and the Company, the interpretation 
of these terms and conditions and the sale of products 
by the Company shall be governed by Oklahoma law, 
without regard to any principles of conflict of laws.
ARBITRATION Any dispute arising under or in con 
nection with these terms and conditions or the sale of 
products shall be settled by binding arbitration admin 
istered by the American Arbitration Association under 
its Commercial Arbitration Rules, and judgment on the 
award rendered by the arbitrator may be entered in 
any court having jurisdiction thereof. The dispute shall
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be resolved by one neutral arbitrator who shall have no
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affiliation with either Purchaser or the Company and 
shall be selected by the American Arbitration Associa 
tion office in Dallas, Texas. The arbitration proceed 
ings shall be held in Muskogee, Oklahoma.
APPLICABLE DOCUMENTS The agreement be
tween the Company and the Purchaser relating to the
products includes these terms and conditions of sale, 
any applicable installation and maintenance instruc 
tions provided by the Company and any terms appear 
ing on the Company’s quotation, sales order acknowl 
edgment and invoice.
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WARNING The Company products are designed and manufactured to provide reliable performance but they are not guaranteed to be 100% free of defects. Even reliable prod 
ucts will experience occasional failures and this possibility should be recognized by the Purchaser and all End Users. If these products are used in a life support ventilation sys 
tem where failure could result in loss or injury, the Purchaser and all End Users should provide adequate back-up ventilation, supplementary natural ventilation or failure alarm 
system, or acknowledge willingness to accept the risk of such loss or injury.
WARNING DO NOT use in HAZARDOUS ENVIRONMENTS where fan’s electrical system could provide ignition to combustible or flammable materials unless unit is specifically built for hazardous environments. Comply with all local and national safety codes including the National Electrical Code (NEC) and National Fire Protection Act (NFPA).
CAUTION Guards must be installed when fan is within reach of personnel or within eight (8) feet (2.5 m) of working level or when deemed advisable for safety.
DISCLAIMER The Company has made a diligent effort to illustrate and describe the products accurately in all Company literature; however such illustrations and descriptions
are for the sole purpose of identification and do not express or imply any warranty.
LIMITED WARRANTY
WARRANTY AND DISCLAIMER: the Company ex-
tends this limited warranty to the original purchaser 
and warrants that products supplied by the Company, 
shall be free from original defects in workmanship and 
materials for two years from date of shipment (except 
for the warranty periods noted for products listed be 
low), provided same have been properly handled, 
stored, installed, serviced, maintained and operated. 
This warranty shall not apply to products which have 
been altered or repaired without the Company’s ex 
press authorization, or altered or repaired in any way 
so as, in the Company’s judgment, to affect its perfor 
mance or reliability, nor which have been improperly 
installed or subjected to misuse, negligence, or acci 
dent, or incorrectly used in combination with other sub 
stances. The Purchaser assumes all risks and liability 
for results of use of all products.
Evaporative cooling pads are warranted to be free of 
defects in materials and workmanship for a period of 
two years from date of shipment provided same have 
been properly handled, stored, installed, serviced, 
maintained and operated; and further, not subjected to 
excessive heat, corrosive agents or chemicals, or me 
chanical abuse that may cause tearing, crushing or un 
due deterioration, nor used on a system or in a manner 
other than that for which it was designed as explained 
in the product literature.
The following products are warranted to be free of de 
fects in materials and workmanship for the periods 
shown from date of shipment: the Company’s exclu 
sive duplex split pillow block bearings and shaft five 
years, belts one year, Polyethylene tubing 90 days, 
AIR40 Heater warranty one year, AIR40 Emitter war 
ranty three years and DDP fan lifetime warranty on its 
propeller, cone, and housing.
LIMITATION OF REMEDY AND DAMAGES: All 
claims under this warranty must be made in writing and 
delivered to P. O. Box 978, Muskogee, Oklahoma, 
74402, within 15 days after discovery of the defect and 
prior to the expiration of two years from the date of 
shipment by the Company of the product claimed de 
fective, and Purchaser shall be barred from any 
remedy if Purchaser fails to make such claim within 
such period.
Within 30 days after receipt of a timely claim, the Com 
pany shall have the option either to inspect the product 
while in Purchaser's possession or to request Pur 
chaser to return the product to the Company at Pur
chaser's expense for inspection by the Company. The 
Company shall replace, or at its option repair, free of 
charge, any product it determines to be defective, and 
it shall ship the repaired or replacement product to 
Purchaser F.O.B. point of shipment; provided, how
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ever, if circumstances are such as in the Company’s 
judgment to prohibit repair or replacement to remedy 
the warranted defects, the Purchaser's sole and exclu 
sive remedy shall be a refund to the Purchaser of any
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part of the invoice price, paid to the Company, for the 
defective product or part.
The Company is not responsible for the cost of re
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moval of the defective product or part, damages due to
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removal, or any expenses incurred in shipping the 
product or part to or from the Company’s plant, or the 
installation of the repaired or replaced product or part.
The warranties set forth above do not apply to any 
components, accessories, parts or attachments manu 
factured by other manufacturers; such being subject to 
the manufacturer’s warranty, if any. To the extent not 
prohibited by the manufacturer’s warranty, the Com
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pany shall pass through to Purchaser such manufac
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turer’s warranty.
THE COMPANY’S WARRANTY IS IN LIEU OF ALL 
OTHER WARRANTIES, EXPRESS OR IMPLIED, 
ARISING BY LAW OR OTHERWISE, INCLUDING
WITHOUT LIMITATION THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PAR
TICULAR PURPOSE, WHICH ARE HEREBY EX
PRESSLY DISCLAIMED AND WAIVED. THIS WAR 
RANTY CONSTITUTES THE COMPANY’S SOLE
AND EXCLUSIVE WARRANTY FOR DEFECTIVE
GOODS AND PURCHASER’S SOLE AND EXCLU 
SIVE REMEDY FOR DEFECTIVE PRODUCTS.
No employee, agent, dealer, or other person is autho 
rized to give any warranties on behalf of the Company 
or to assume for the Company any other liability in 
connection with any of its products except in writing 
and signed by an officer of the Company.
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REPLACEMENT PARTS If replacement parts are or 
dered, purchaser warrants that the original compo 
nents in which these replacement parts will be placed
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are in satisfactory working condition, and when said re 
placement parts are installed, the resultant installation
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will operate in a safe manner, at speeds and tempera
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tures for which the original product was purchased.
TECHNICAL ADVICE AND RECOMMENDATIONS, 
DISCLAIMER: Notwithstanding any past practice or
dealings or any custom of the trade, sales shall not in 
clude the furnishing of technical advice or assistance
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or system design. Any such assistance shall be at the 
Company’s sole option and may be subject to addi 
tional charge.
The Company assumes no obligation or liability on ac
count of any recommendations, opinions or advice as 
to the choice, installation or use of products. Any such 
recommendations, opinions or advice are given and
shall be accepted at Purchaser's and End User's risk
and shall not constitute any warranty or guarantee of 
such products or their performance.
LIMITATION OF LIABILITY The cumulative liability of 
the Company to the Purchaser and any other persons 
for all claims in any way relating to or arising out of the
products, including, but not limited to, any cause of ac
tion sounding in contract, tort, or strict liability, shall not 
exceed the total amount of the purchase price paid for
those products which are the subject of any such
claim. This limitation of liability is intended to apply
without regard to whether other provisions of this 
agreement have been breached or have proven inef 
fective even if the Company has been advised of the 
possibility of such claims or demands. In no event 
shall the Company be liable to the Purchaser or any 
other person for any loss of profits or any incidental,
special, exemplary, or consequential damages for any
claims or demands brought by the Purchaser or such
other persons.
INDEMNITY The Company’s maximum liability to Pur
chaser and to any end user is as set forth above. The 
Company makes no warranty to anyone for any prod 
ucts not manufactured by the Company and shall have
no liability for any use or installation of any products 
(whether manufactured by the Company or other man 
ufacturers) not specifically authorized by this sale. 
Purchaser acknowledges various warnings by the 
Company regarding the products and its installation
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and use. If the Company incurs any claims, lawsuits,
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settlements, or expenses (including attorney fees) for 
any loss, injury, death or property damage including,
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but not limited to, claims arising out of the Purchaser’s 
or any end user’s installation or use of the products,
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the Purchaser shall indemnify and hold the Company 
harmless.
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September 2006 613114