OPERATION & MAINTINENCE INSTRUCTIONS FOR
MDK18
Pass Thru Air Lock
Cleanroom Entry System
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Table of Contents
Safety Warnings
Installation
Wall Mounted Pass Thru Installation
Fire Rated Pass Thru Installation
Operation & Maintenance
Interlock Operation
HEPA Filter Operation
Maintenance
Troubleshooting
Read and Save These Instructions
Please observe the following information related to your product
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Read this guide before installing and/or operating the unit.
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Keep this guide as a reference to the safety and operating instructions.
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Observe warnings associated with handling, installing, using, and maintaining the MDK18.
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Follow all instructions for set-up, operation, and use.
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Operate ONLY from the type of power source indicated. If you are unsure of the type of power
available to you, contact your dealer or power company.
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This unit may be equipped with a polarized alternating current (AC) plug with one blade wider
than the other. This plug will only fit into the power outlet one way for safety reasons. If the
plug does not fit, call an electrician to replace the outlet. DO NOT REMOVE THE ROUND
GROUNDING TERMINAL. THIS UNIT MUST BE GROUNDED FOR SAFETY REASONS AND FOR
PROPER OPERATION.
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Do not place any power cords where they will have things placed on or against them, be
walked on, or be pinched, especially near the outlet, the plug, or where the power cord exits the
unit.
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Overloading outlets and/or extension cords can result in fire and/or electrical shock.
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ONLY use parts supplied by the manufacturer. Substitutions may result in fire, electrical shock,
or other safety hazards.
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OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System
OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System
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Safety Warnings
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Never expose the assembly to moisture or rain.
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If the unit gets wet, disconnect the power at the source and have an authorized service
inspection before using it again.
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Do not pull on power cords to unplug the unit, and never handle the cord with wet hands.
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Do not clean the unit with flammable chemicals.
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Do not expose to explosive or hazardous vapors or materials.
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Make sure the unit is well supported to prevent falling.
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Do not block airflow to the unit.
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Disconnect the power before servicing.
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Do not operate below 0 degrees Fahrenheit or above 110 degrees Fahrenheit.
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This unit is designed to operate in a non-hazardous (non-explosive) environment with non-
condensing air.
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NEVER put objects into the blower.
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Do not operate blower without metal blower guard.
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Review application with your safety commissioner for proper use
Installation
Notes
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Pass thrus must be installed in a flat and level wall capable of supporting the weight of the
pass thru. Weight depends on size, model, and options package.
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The pass thru should be well supported on all sides and securely mounted so that it will not
shift when weight is inserted. If the pass thru is not securely mounted it may loosen over time.
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Pass thrus need to be installed so that they are square and level. This is critical to ensure
proper alignment of the latch and interlock components.
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The recommended wall cutout is ½” larger than the exterior of the pass thru in each direction.
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Sloped top mounting frames should be attached to the pass thru before installing in wall. If
there is a sloped top on both sides, one side is screwed into the pass thru and the wall, the
opposite side is only screwed into the wall.
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After installation sealant may be needed to fill any gaps between the pass thru and mounting
frames. Silicone or polyurethane caulk is recommended for this.
Standard Wall Mounted Pass Thru Installation
Before installation locate all mounting frames and mounting frame hardware. The “notched” frame
pieces attach to the vertical sides of the pass thru. Wall mounted pass thrus featuring universal
mounting frames can be installed in a variety of configurations as outlined below.
OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System
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Fire Rated Pass Thru Installation
Most fire rated pass thrus come with pre-installed universal anchoring brackets welded into the
frame throat as shown. These can be anchored to a variety of wall types. Below are the most
common installation methods.
The pass thru must be installed plumb and square to ensure proper door alignment. Shimming may
be necessary to square the cabinet.
Installation Notes
It is recommended that floor
mounted fire rated units be anchored
to the floor in addition to the wall.
Maintain clearance between frame
return flanges and stud for inserting
drywall.
Do not install drywall until you are
certain the frame and pass thru are
plumb and square.
Drywall must extend at least ½” into
the frame.
OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System
6
Operation & Maintenance
After installation the pass thru should be checked for proper function. Door latches and interlock
components should be aligned and operate smoothly.
Interlock Operation
Pass thru interlocks prevent both doors from being open at the same time. When one door opens
the opposite side is locked. The most common interlock styles are listed below.
90° Rotation T-Handles
The T-handles are connected so when one side is unlocked (T-
handle vertical) the opposite side will be locked (T-handle
horizontal). The T-handles can only be turned when both
doors are closed; when one door is open the internal guide
pin is decompressed and will prevent the T-handles from
turning.
Fire Rated / Bio-Design Interlocks
Fire rated and Bio-Design interlocks do not have stainless steel T-handles. They both have interlock
mechanisms which will lock the opposite side automatically as soon as a door is opened.
Magnetic Interlocks
If your pass thru is equipped with magnetic style interlocks the doors are normally locked. The doors
are unlocked by an illuminated capacitive touch button. When both of the doors are closed the
buttons are green the doors can be unlocked. If a door is open the buttons are red and the opposite
door cannot be unlocked.
HEPA filtered units equipped with the optional air shower style controls may also be locked while the
filter is running. Wiring schemtics are included with the manual inside unit.
HEPA Filtered Pass Thru Operation
HEPA filter blowers are set to a velocity of 90ft/min from the factory and feature a speed control for
adjustment in the field. HEPA filters will remove 99.99% of airborne particles at 0.3 µm. Test sheets
and a wiring schematic are included in each pass thru with the manual.
Do not touch the filter media; if the media becomes damaged the filter will need to be replaced.
Air Flow
Recirculating HEPA filtered pass thrus continuously recirculate the air through perforations in the
walls. Single pass HEPA filtered pass thrus purge air through the perforated dirty side door. Air flow
diagrams can be found on our website.
OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System
7
Maintenance
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At least once a day wipe down interior surfaces and knobs. Contaminate can get into the pass
thru while the dirty side door is open. Particles can float into the pass thru and settle on the
interior. If left uncleaned this contamination can then be transferred into the cleanroom.
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If the pass thru doors feature polycarbonate or acrylic windows wipe them down lightly with
soft cleanroom wipes to avoid scratching. Verify that any cleaning chemicals used are
compatible the with window material before cleaning.
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Once a year check that the pass thru is securely mounted. All hardware, including perimeter
mounting screws should be securely fastened.
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Verify that any cleaning chemicals used are compatible with cabinet materials.
Troubleshooting
Mechanical Interlock T-handles will not turn
Check that the interlock strikes aren’t bent; they should be at a 90° angle to the door.
Mechanical Interlock T-handles turn even when the door is open
Look inside the rectangular slot on the front of the cabinet to check that the guide pin is
functioning properly.
OPERATION & MAINTINENCE INSTRUCTIONS
MDK18
Pass Thru Air Lock Cleanroom Entry System