Things To Consider When Planning a Cleanroom

Use only 3rd Party, ISO/IEC 17025:2017 Accredited Laboratory for your Cleanroom needs at all stages of development and operation.


Whether your cleanroom is to be a "Stick Built" - "Hybrid" - "Modular Hardwall" or "Softwall", these are a few items to address with your design team up front!

1. Determine the product process flow initinally, to see where the most effective placement of the HEPA filters in the ceiling grid will be!

2. Will there be a downstream access port for filter challenge.

3. Are the HEPA filter installers trained on installing the HEPA filters properly.(Ask the filter supplier this question in the design stage)

4. When is it time to change the HEPA filters (Ask the filter supplier this question in the design stage)

5.Set aside a lay away budget plan for the replacement of the HEPA filters.

6. What is the right sealant to be used for sealing wall/ceiling penetrations.

7. Will you need a  Pass-Thru or Air Shower.

8. Will the flooring be conductive or non conductive.

9. Will you be using a Central Vacuuming System or a Portable HEPA Vacuum.

10. DO NOT skimp on the size of the Gown Room.

11. Where are you going to store the custodial equipment and supplies.

12. Where are you going to store the extra garments.

13. When purchasing a softwall cleanroom, discuss with your vendor about room pressurization recommendations per ISO 14644-4 guidelines.

14. Make sure your cleanroom garment provider is providing you with a "Certificate of Cleanliness" per ASTM F51/F51M testing methods on each delivery to assure that your garments are clean.

 To better aid you in your  cleanroom endeavors, download our articles on the front page of our website.

Check our website for our 2022 training seminar schedule.


Ralph Kraft is available for speaking engagements at your function, bringing his past and current experiences of troubleshooting and certifying cleanrooms (since 1977)  to your organizations membership.

Ralph can provide a talk on (1) Design Considerations for those contemplating a cleanroom  and the value of  a "Build Clean" methodology program for the construction phase of our cleanroom or (2) The Value of Establishing an on-going Monitoring Program for optimal operational efficiency.

Contact Ralph at rk.cleanroomservices@gmail.com for further discussion.


We are looking for a Customer Oriented individual to assist us in the Testing/Certificaton of Cleanroom Facilities, Biological Safety Cabinet's and Laminar Flow Benches within the Upstate NY area.

If you are interested in entering the cleanroom consulting/testing industry (we provide training) or have past HVAC Air Balance or Cleanroom Certification experience looking for a change, we would like to talk to you.

Must be able to pass Federal/State Drug and Background checks.

Valid drivers licence and reliable transportation a must (gas allowance provided)

Strong organizational, communication, presentation skills, able to work alone and in a team setting

Microsoft Word Doc, Excel. CadCam astute.

Able to lift 50 lbs. Able to work on equipment in kneeling, standing, sitting, bending positions.

Position is full time (salaried) with paid vacation.

Agency is Rochester, NY based.

Contact Jeffrey Brooks at JB.CleanroomServices@gmail.com for more information.

The Value of an On-Going Monitoring Program

Keeping your cleanroom and laminar flow bench operating at optimum efficiency is essential. This means having an active On-Going Monitoring Program (OGMP) in place, either by internal personnel or utilizing your Certification Agency on a more regular basis.


HEPA Filter Life Expectancy Check

Find out what the initial pressure drop of the HEPA filter is (this can be found on the side of the filter housing) and what the final recommended pressure drop is for filter replacement from the filter manufacture you are using.

Gage: Dwyer # 2001 ( 0.0-1.0” Wg.)            

Tubing size: 3/16”-1/4” ID (to fit the Dwyer hose fitting that comes with the gauge)

Drill a ¼” hole in the “Tin Can” portion (between the air inlet and above the HEPA filter media). of the HEPA filter housing and install the high side of gauge tubing.

Seal this penetration (tight) with a non-silicone approved sealant.

Run the tubing across the ceiling within the plenum to a corner of the cleanroom and drop this tubing down into the cleanroom to about 6 feet above floor level for ease of access to hook up a portable differential monitoring device (or the in-place Dwyer # 2001 gauge mentioned above and leave the low port open).

Make sure the ceiling penetration is also sealed with the approved sealant.

Repeat this sequence for each room you want to monitor.(using one HEPA filter in each area as a typical)

The monitoring and recording of each designated HEPA filter should be part of the certification visit and be part of a in-house monitoring program on a monthly basis.


HVAC System HEPA Filter Replacement:

Before you install new (replacement) filters in the holding frame, MAKE SURE that the holding frame is free of any debis that may allow air to by-pass the filter media. You DO NOT want any air to by-pass the filter media as it will show up on the filter challange and you will have to reseat the filter in the frame.

R. Kraft, Inc
478 Manse Lane 
Rochester, NY 14625
United States of America

Tel: (585) 621-6946
Email: for more information

Let our 45 + yrs of cleanroom experience

assist you in achieving and operating a cost effective cleanroom facility.

( 3rd Party Certification, Troubleshooting, Performance Appraisals, Training Seminars, Design Assistance from a Service Provides viewpoint, Construction/Project Management)

R. Kraft Inc. is a

3rd Party

ISO/IEC 17025:2017 Accredited Laboratory,

Testing and Certifying Cleanrooms and Laminar Flow Devices


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