how to enter a clean room

I have such a weird sense of humor. I know there is a need for this, but it somehow doesn’t inspire me to go clean my house like I thought it would if I read it. I just thought you might like to know this valuable info, too. So I share it, knowing it gives me (and hopefully you) some great relief in that we don’t have to be perfectionists in our home! I found this over at WikiHow.

How to Enter a Cleanroom
A cleanroom is an environment, typically used in manufacturing or scientific research, that has a low level of environmental pollutants such as dust, airborne microbes, aerosol particles and chemical vapors. If you have been asked to work in one, you’ll need to take the appropriate steps to avoid introducing contamination.
There is no single type of cleanroom or single set of rules for entering, so make sure to get training and instruction for the particular cleanroom you will enter.

Fine circuitry is easily damaged.Understand the purpose of cleanroom protocol. Processes require cleanrooms because any speck of dust can damage the processes that occur inside them. Physical contaminants include skin cells that flake off, dandruff, clothing fibers, and loose hair. Paper, pencils, packaging materials, and many other things shed dust, and even tiny particles can damage the delicate products built and tested in cleanrooms.
Know what class of cleanroom you’re entering. There are a couple of different sets of standards, but in general, the lower the number, the cleaner the cleanroom.
Recognize that humans are generally the single largest source of contamination within a cleanroom.

Bouffant caps and smocks.Follow the instructions given by your employer or whoever operates and maintains the cleanroom. Cleanroom apparel varies. It may consist of gloves, a cap, and smock at its most basic all the way up to a full “bunny suit”. These are general instructions.
Shower in the morning on any day you will enter a cleanroom.

Powder = particles.Do not wear cosmetics, hair spray, perfumes, or colognes into a cleanroom.
Wear appropriate attire under your cleanroom garb. Skirts, high-heeled shoes, shorts, and in some cases, short-sleeved shirts are not appropriate attire. Also steer clear of clothing that is especially fuzzy or tends to produce a lot of lint or static electricity.
Clean your shoes on the way in.
If there is a machine at the door for this purpose (spinning brushes), use it. Place your foot and shoe together inside it. Hold the handle to steady yourself, then press the button. You’ll feel a slight tug on your shoe from the moving brushes, but it won’t damage your shoe.
If there is an adhesive doormat, step on it several times.
Stow personal items you won’t be taking into the cleanroom. Leave them at your desk or use lockers, if they are provided.
Discard candy, gum, or anything else in your mouth.
Put on a hair cover (bouffant cap) and/or hood. Use a beard cover to cover any facial hair (beard or mustache).
Put on shoe covers or booties.

An inspection process with hoods and coveralls.Put on coveralls or a smock. Zip or snap it closed all the way up, over the neck of the hood if you are wearing one. Close any snaps at the cuffs to gather the sleeves snugly around your wrists.
Put on safety glasses, goggles, or a face shield, and hearing protection, as required.
Put on latex gloves, or the appropriate substitute for those allergic to latex.
Pass through the air shower if there is one and step on any additional adhesive mats as you enter.

A wafer handler.Keep cleanroom protocol in mind whenever you work within a cleanroom.
Keep your cleanroom apparel on at all times when working in the cleanroom.
Do not bring in any of the following items: pencils (note that graphite is conductive), erasers, non-cleanroom paper, wood, abrasives, or packaging materials such as cardboard. Keep non-cleanroom paper in a plastic sleeve if you must refer to it. Use only cleanroom tape. Be aware of what else you bring in.
Correctly wipe down any equipment you bring in. Do not remove cleanroom equipment from a cleanroom.
Move slowly and evenly. Rapid, sudden, or jerky movements can shed many particles.

NASA workers in bunny suits (coveralls).Replace any cleanroom attire that is worn or soiled. Even cleanroom apparel gets dirty as you wear it and work in it. If it has been a while, make sure you have yours cleaned and get a fresh one.
Use fresh gloves, hair covers, and disposable shoe covers every time you enter.
You can reuse smocks, coveralls, reusable shoe covers, and reusable caps or hoods, but exchange or have them cleaned periodically.
Remove cleanroom attire in the opposite order from that in which you donned it. Remove cleanroom attire each time you leave the cleanroom. Do not exit the cleanroom wearing or carrying cleanroom attire. Put it on each time you enter and take it off and store it correctly each time you leave.


There is a specific order to be followed when garbing up for entry into a cleanroom, depending on the cleanliness level. “Top to bottom” is a good rule to follow.
FIRST: Remove all body articles, including badges, earings, gum, pens, pencils (graphite is BAD!), etc. You may be required to also remove watches, rings, etc. The point is you don’t want ANYTHING to drop from you, ever. Also obey rules for perfume, nail polish, mascara, facial hair, etc.
1: Start with hood/mask/head gear.
2: Put on body suit, or jacket first, then pants.
3: Utilize a bench to separate “getting dressed” area from “dressed area”. Put a sticky mat on the “dressed” area floor next to the bench.
4: Sit on the bench and put on booties (pants tuck inside), never letting the booties touch the ground on the “getting dressed” side of the bench. Put on booties while sitting on the bench with your leg lifted up, then lowering each foot to the “dressed” side of the bench onto the sticky mat.
5: LAST: Stand up on the “dressed” side of the bench. Put on gloves. Tape up gloves and ankles if necessary.
6: Act as if you are now a surgeon – don’t touch anything until you are in the cleanroom.
Always ask for instructions from others who work in or maintain the cleanroom, and follow those instructions rather than these ones, if they differ.
If you visit a cleanroom you do not normally enter, find out the correct procedure for gowning.
If there is an airlock or gowning room on the way in, open only one door at a time.

Microelectronics are sensitive to more than particles.If you’re working with electronics, take the appropriate steps to control electrostatic discharge (ESD).
The order of your preparation matters. For instance, if you put on your gloves and then use your hands to gather your hair and put it under a cap, the gloves will have oil and skin flecks on the outsides from your hair. Ask what the correct procedure is. If you’re still not sure, go from inside to outside, and dirtiest to cleanest.
Get cleanroom attire that is the correct size for you. You will be much more comfortable working in a suit that fits, especially if you spend a lot of time in it.
Try on smocks, bunny suits, and shoe covers or ask to be measured for them when you first start. Use the included snaps to adjust the size further.
Learn what size gloves you wear. If your hands sweat in latex gloves, see if you can get fabric glove liners to go underneath.
Get prescription safety glasses if you wear glasses. Your employer may offset the cost, and they are far more comfortable than wearing safety glasses over your glasses.
Hair and beard covers generally come in only one size.
If the cleanroom deals with electronics, you may need to follow additional procedures to cut down on electrostatic discharge (ESD) for sensitive items.


Understand any safety issues involved in working in a cleanroom. There may be hazardous materials, heavy equipment, high temperatures, sharp objects, tight spaces, and high voltage. If you are working alongside any of these or other hazards, be sure you are properly trained for them. Understand and follow the proper precautions.
Never eat, drink, or smoke in a cleanroom.

Now aren’t you glad you don’t have to even ENTER a clean room, much less, get one to this level of perfection! Thank you Lord for my own imperfection especially where housework goes. I wouldn’t have any friends left at all. Happy Friday!


8 thoughts on “how to enter a clean room

  1. Well, I’m happy to know you didn’t read it all…..I was worried about you!!!!! Just teasing!

    Not to worry on the Butterfinger!

    I still want Jean #1 to fess up!

    Jean #2

  2. Hey, I haven’t even read it all. Hope none of it is off color…Just overwhelmed me to the point of needing to share! I still want some Butterfinger!!!

  3. Sorry, Angie, too late!!!! 🙂 I ate it ALL and did not share one bit! (I sound a bit proud don’t I? Not to mention selfish! Mmmmm, not good!)

    I bet Jean #1 skipped to the bottom too, Fess up, Jean!


  4. Sorry, but this doesn’t inspire me to want to clean my house! I’m glad the people I love don’t give my house the white glove test! (I have to admit that I skipped to the bottom, too! I don’t have the patience to really read all of this.

    I’ll take a bite of that Butterfinger bar, please?
    Angie xoxo

  5. I skipped!!!!!! :)))))))))))

    PS No need to leave choc. fingerprints….I have dust bunnies everywhere!!!! (More laughing!)

  6. Did you ever find your Butterfinger, JeanM, or your leftover Halloween candy, Jean, because I would like to share it and leave chocolate fingerprints somewhere! I am shocked you both made it to the end to see my well wishes for this day. Smiles, annie

  7. Annie, Annie, Annie, did you actually read all of this???!!!!

    I’m finding me a clean room and I’m taking my cigarette, my donuts with sprinkles, and my fizzed over soda pop in with me!

    Mmmmmph, pretty soon, we won’t be able to have any fun at all!!!!

    PS Yes, and another Happy Friday to you, too!

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