These units are sold by WW Grainger.  Consisting of one Dayton Item # 6E823 Air Curtain Cabinet, Painted Finish, Width 48 Inches, Height 15 3/4 Inches, Depth 12 1/2 Inches, With a Dayton Item # 6E815 Air Curtain Motor/Blower Assembly.  Maximum Air Velocity At Nozzle 5900 FPM, Average Airflow At Nozzle When Installed 4080 CFM, Includes 1-1/2 HP Motor, Motor Speed 3450 RPM

Replacement Parts available at your local WW Grainger.
Used above dock doors, as well as , in kitchens, walk-in coolers, drive-up windows, livestock doors or any opening susceptible to energy loss or temperature variation, air curtains are used to separate two enviroments and/or to prevent flying insects from entering a facilty using high velocity of air..  
Can also be used in conjuction with plastic strip doors or swinging plastic doors at the entrances of both walk-in and reach -in coolers and freezers. These curtains help keep food in the coolers at safe temperatures while doors are continually opened.
Air Curtains create an invisible air seal generated by centrifugal fans that compress air inside the unit and release it through a nozzle.
In locations where smoking in restaurants is permited, some operators use Air Curtains to separate smoking and non-smoking areas.
Air Curtains repel house flies and other pests, mitigating the potential exposure to deseases.

Prevent energy loss or keep bugs out with these Air Curtains
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Dayton Commercial / Industrial Duty Air Curtains
48" wide w/ 1.5 HP Blower--      Pre-Owned    --    Tested
Price:  $575 ea. (1/2 price of new) - Very Good Cond.  -  Sold new for $1155.00 ea.
Purchased at bankruptcy sale - has seen light use.
Being sold by the piece.  We have a total of six.
Excellent buy.  Compare price at WW Grainger.