FS Industries ENGINEERED STEEL PRODUCTS
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DRIVE-THRU UNIT 3
AIR CURTAINS UNHEATED

SERIES #DTU03A
For window heights to 3’
Compact, quiet, simple to mount,
and easy to operate.
Chosen by both QSR managers and restaurant designers
who are concerned with protecting the comfort of the
person working the window, the Drive-Thru Air
Curtain is designed to meet the functional needs of the
application, to integrate into the space and to keep
installation costs to a minimum.
IDEAL APPLICATIONS:
Drive-Thru Windows
Concession Windows
Drive-Thru Unit 3 Series (DTU03) air curtains (a.k.a. air doors) are designed to be competitively priced for indoor
use on drive-thru windows. They are suitable for openings up to 26 in (66.0 cm) wide in single modules (tandem
mount for wider openings), with window heights up to 36 in (91.4 cm) for environmental separation and insect/fume
control.
Air curtains provide environmental separation at openings by reducing the infiltration of unconditioned air, fumes,
dust, and humidity. Optimum protection is provided when units are mounted flush to the wall and as close to top
of the opening as possible. To ensure peak performance keep air stream free of obstructions. Air curtains may
not be fully effective where negative air pressure exists on one side of door; contact us for additional information.
Series DTU03 model air curtains can be wall mounted or ceiling mounted with the "Mount Anywhere" bracket system.
Standard Construction
• 7” high x 7 ¾” deep
• One-speed motor(s)
• Factory installed on/off switch
• Silver powder-coated extruded aluminum
   exterior cabinet
• Optional: Adjustable Extension Bracket
Installation & Mounting
Simple to install, operate & maintain
• Single lengths 18” or 26“
• No Assembly Required
• Factory installed “mount anywhere” bracket system
• 6’ plug-in type power cord		 Control Option
• Magnetic reed door switch kit
NOTES:
1. Air curtain must be installed so air stream is not obstructed when
    deflected 20° to either side of C.
2. Electrical connections to be flexible.
3. Field verify dimensions.
4. Anchors to supporting structure by others.
5. Adequacy of supporting structure is to be verified by a professional
    structural engineer.
6. Letter "AA" in model number designates 120V ambient unit
7. Dimensions in inches [centimeters].
Ambient (Unheated) Air Curtain
Electrical Performance Chart
120/1/60 (voltage code A) Motor AMP Draw = N/A
MODEL
# CKTS
AMPS PER CIRCUIT
BREAKER RATING PER CIRCUIT
DTU03-1018A
1
1.6
15
DTU03-2026A
1
2.2
15
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PRICING SINGLE SPEED AIR CURTAIN
120V. Cord
& Plug
Nozzle
Width
(in) 
Max Vel.
at
Nozzle
(fpm) 
Avg.
Outlet
Vel.
(fpm) 
Air
Volume
(cfm) 
Outlet
Vel.
Uniformity 
Power
Rating
(kW) 
Motor(s)
@ hp 
Net
Wt.
(lbs) 
Price
MODEL 
16.5
2,800
1,047
135
76%
0.06
1 @ 1/12
9
$706
24.5
2,800
1,045
200
79%
0.1
1 @ 1/12, 1 @ 1/20 
14
$950
NOTE: Operation at 50 Hz will generate approximately a 17% reduction in air performance.
See table below for amp draws/total load requirements.
DRIVE-THRU UNIT ACCESSORIES
Model
Description
Price
ELECTRICAL ACCESSORIES
Load Center Box Kit 120V with Magnetic Reed Door Switch
$423
MECHANICAL ACCESSORIES
Adjustable Extension Bracket
$108/pair
INSTALLATION & MAINTENANCE INSTRUCTIONS
Your new Drive-Thru air curtain(air door),
properly installed, maintained and operated,
will keep fumes out of your restaurant,
increase employee comfort, and save energy.
TABLE OF CONTENTS
I. UNCRATING
II. MOUNTING INSTRUCTIONS
III. WALL MOUNTING
IV. ELECTRICAL CONNECTIONS
V. OPERATION INSTRUCTIONS
VI. MAINTENANCE AND CLEANING
VII. SERVICE
WARNING: TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK OR INJURY TO PERSONS,
OBSERVE THE FOLLOWING:
A. Read all instructions before installing or using this air curtain.
B. Use this unit only in the manner intended by the manufacturer and described in this manual. Any other use not
     recommended by the manufacturer may cause fire, electric shock, or injury to persons. If you have any questions,
     contact the manufacturer.
C. Before servicing or cleaning unit, switch power off at service panel and lock the service disconnecting means to
     prevent power from being switched on accidentally. When the service disconnecting means cannot be locked,
     securely fasten a prominent warning device, such as a tag, to the service panel.
D. Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable
     national and local codes having jurisdiction, including fire-rated construction. See, ELECTRICAL
     CONNECTIONS (NEC Code ANSI/NFPA No. 70).
E. When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.
F. To reduce the risk of fire, do not store or use gasoline or other flammable vapors and liquids in the vicinity of the
     air curtain.
G. This air curtain is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. Keep combustible
     materials, such as furniture, pillows, bedding, papers, clothes, etc. and curtains at least 1 inch from the top,
     back, front, sides and at least 6 feet from the discharge of the air curtain.
H. Extreme caution is necessary when any air curtain is used by or near children or invalids, and whenever the
     heater is left operating unattended.
I. Do not operate any air curtain after it malfunctions. Disconnect power at the service panel and have the air
    curtain inspected by a reputable electrician before reusing.
J. To disconnect the air curtain, turn controls to “off”, and turn off power to the air curtain circuit at main disconnect
    panel.
K. Do not insert or allow foreign objects to enter any ventilation or discharge opening as this may cause an electric
     shock or fire, or damage the air curtain.
L. To prevent a possible fire, do not block the air intake or discharge of the air curtain in any manner.
M. The air curtain has hot and arcing or sparking parts inside. Do not use it in areas where gasoline, paint, or
      flammable vapors or liquids are used or stored.
N. This heater may include an audible or visual alarm to warn that parts of the heater are getting excessively hot.
      If the alarm sounds (or illuminates), immediately turn the heater off and inspect for any objects on or adjacent
      to the heater that may have blocked the airflow or otherwise caused high temperatures to have occurred.
      DO NOT OPERATE THE HEATER WITH THE ALARM SOUNDING (OR ILLUMINATING).
I. UNCRATING
Carefully examine the carton(s) for damage before
opening. If the carton is damaged, immediately notify
shipping company. If the unit(s) were shipped on
wooden skids, remove protective wood and banding
straps securing the carton(s) to the skid. Open the
carton(s) and remove all protective packaging.
Immediately verify that the electrical rating nameplate
located on the cover matches electrical power supply
available. Retain the shipping carton(s) until the unit(s)
is installed and properly operating.		 A. When determining the mounting location for the
unit(s), make sure that nothing interferes with the
curtain of air developed when the discharge vanes
are directed from 0º to 20º toward the drive-thru
window opening. If the air stream strikes any ob-
struction (the top edge of the window, a window
opening device, etc.), the effectiveness of the unit
will be greatly reduced (See Drawing 1).
ACCESSORIES: If the unit(s) was ordered with
optional electrical accessories, the accessories may
be found in the carton containing the unit or in a separate
carton(s) accompanying the unit(s). Check all of the
cartons/skids for accessories before discarding.
II. MOUNTING INSTRUCTIONS
(General Notes for All Mounting Configurations)
INDOOR MOUNTING ONLY!
Environmental/Insect/Dust & Fume Control
The Drive-Thru Unit 3 air curtain is designed to be an
effective barrier against cold drafts in the winter and
hot air in the summer. To achieve optimum protection,
the unit should be mounted on the inside of the building,
as close to the top of the window opening as possible.
To ensure peak performance, keep the air stream free
of obstructions. The unit is equipped with mounting
brackets to ensure proper mounting in most applications.
The air curtain will not perform properly if negative
air pressure exists in the building. Under these
conditions, a means for makeup air to the building
must be provided so that the air pressure on both
sides of the opening is in balance.
DRAWING 1
Before mounting the unit, check the supporting structure
to verify that it has sufficient load-carrying capacity to
support the weight of the unit(s). The mounting hardware
should be capable of supporting a minimum of three (3)
times the weight of the unit (See price table above).		 B. For optimum performance, the bottom of the unit
(discharge nozzle) should be no more than 1” above
the top of the drive-thru window opening with the unit
mounted flush to the wall. If the unit must be mounted
higher, it must be spaced out from the wall 3/8” for
every inch the unit is above the drive-thru window
opening.
III. WALL MOUNTING
The Drive-Thru Unit 3 air curtain is shipped with a variety
of wall mounting options. Included in standard orders are
standard brackets (See Figure 1) and spanning legs (See
Figure 2). Adjustable brackets (See Figure 3) available
by special order.
C. Electric heated units shall:
1. Have a minimum clearance of at least 1” between
    the sides and top of the unit and any combustible
    material.
2. Have a minimum clearance of at least 18” between
     the bottom of the unit and the counter.
FIGURE 1 -Standard Brackets
FIGURE 2 -Spanning Brackets (works with both standard and adjustable extension brackets)
FIGURE 3 -Adjustable Extension Brackets (optional, must be ordered separately by special order)
IV. ELECTRICAL CONNECTIONS VI. MAINTENANCE AND CLEANING
CAUTION: ELECTRIC SHOCK HAZARD:
All electrical wiring and connections MUST be performed
by qualified personnel in accordance with the National
Electrical Code ANSI/NFPA No. 70 (latest edition) or,
in Canada, the Canadian Electrical Code, Part 1-C.S.A.
Standard C22.1, and local codes and regulations.
Disconnect power when servicing unit.
More than one disconnect may be required to
de-energize unit.
Keep your air curtain operating at peak efficiency by
cleaning the blower wheels, motor(s) and intake grille.
Build up of dust on the blower wheels can cause vi-
bration, noise and excessive wear on the motor bearings.
The frequency of cleaning will depend on the environment
where the unit is operating.
A. Check the rating nameplate on the top of the unit for
supply voltage and current requirements (See Figure
2). Unheated units may be plugged into any 15 or
20 amp receptacle. Heated units require a dedicated
20 amp receptacle and circuit. A disconnect switch
for each branch circuit is a required part of this
installation.
Dirty, dusty or greasy environments could require a
cleaning schedule of once every two months. If the
environment is not that dirty, the unit(s) should be
scheduled for cleaning a minimum of once every
(6) months.
B. All field wiring must be copper with a minimum in-
sulation of 60°C within approved conduit. If any of
the wire supplied with the unit must be replaced, it
must be replaced with copper wiring with a minimum
insulation of 90°C.
To remove the filter:
This unit is equipped with a “No Tool” filter removal.
Simply, pull the (2) black tabs, located underneath the
intake grille, outward. This action releases the filter which
then can be pulled downward out of the unit (See
Figure 4).
V. OPERATION INSTRUCTIONS
A. General Operation
1. The unheated Drive-Thru Unit 3 air door operates
    with a two position on-off switch.
2. The heated Drive-Thru Unit 3 air door operates
    with a three position fan-off-heat switch.
B. Air Flow Adjustments
1. With the air door operating and the door in its full
     open position, check to see that nothing is obstruc-
     ting the air flow at the discharge nozzle vanes.
2. Find the air stream split location. Hold a handker-
    chief or tissue, by its corners, approximately 4”
    above the counter. Gently move the handkerchief
    back and forth in the doorway. Make sure the air is
    being directed to both the inside and the outside.
    The split location is indicated where the handker-
    chief is vertical with minimal or no fluttering.
FIGURE 4 -Filter Removal
To clean the interior of the unit:
3. Rotate the air curtain by adjusting its position in the
    mounting bracket so the split location is appro-
    ximately 2” outside the window (See Drawing 1).
A. Disconnect the power to the unit; remove the intake
grille by removing the (4) screws on one side of the
unit. Pull the top of the end cap outward to release
the filter tab to remove end cap. Slide the intake grille
out of unit (See Figure 5). It is not recommended to
remove the blower assembly from the cabinet. To
clean the motor and blower wheels, with the filter
and inlet screen removed, blow compressed air in
the unit to remove loose dust and debris.
CAUTION: STAND CLEAR OF THE UNIT OR
WEAR SAFETY GOGGLES AS LOOSE DEBRIS
MAY BE PRESENT AND MAY EXIT THE
NOZZLE.
B. Connect power and switch the power on after
     cleaning.
FIGURE 5 -Removing End Cap
VII. SERVICE
CAUTION: ELECTRIC SHOCK HAZARD:
Disconnect power when servicing unit.
More than one disconnect may be required to de-
energize unit.
Any service performed on the Drive-Thru Unit 3 air
curtain MUST be done by qualified personnel.
Air curtains require very little servicing. All parts are
easily accessible for periodic inspection and maintenance.
Units should be cleaned at least twice a year. Your
particular application (the amount of dirt and dust in the
air) and location of the unit(s) will determine how often
your unit(s) will need to be cleaned and serviced. All
motors have permanently lubricated, sealed, sleeve, or
ball bearings and require no maintenance.
A. REPLACEMENT OF ELECTRIC HEATER
ELEMENT
1. Disconnect power to the unit.
2. Remove the end cap and intake grille by removing
    the screws on one end of the unit and sliding the
    grille out.
3. Remove and mark all wires from damaged element.
4. To remove damaged element from unit, slide it out
    through the front of the unit.
5. Install new element and connect all wires.
6. Reinstall intake grille and end cap.
7. Connect power and turn power on.
Drive-Thru Unheated Air Curtains, Drive-Thru Air Curtains, Commercial Air Curtain, Commercial Air Door, Air Curtain,
Unheated Air Curtains, and Insect Barrier from your source for material handling equipment.
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