GMP Grade B Cleanroom Gowning Procedure: Annex 1 Requirements + 42-Step Example

Originally published June 6, 2021 • Updated August 17, 2026

Grade B is the background cleanroom for Grade A aseptic preparation and filling when an isolator is not used. Because personnel are a significant contamination source, gowning is part of the facility’s broader contamination-control system rather than a stand-alone dressing routine.

What Does EU GMP Annex 1 Require for Grade B Gowning?

Is a 42-Step Grade B Gowning Procedure Required by Annex 1?

No. Annex 1 specifies contamination-control principles, personnel qualification, garment requirements and gowning controls, but it does not publish a mandatory 42-step sequence. A detailed step count is normally facility-specific and should reflect room layout, garment design, barrier benches, disinfectant practice, transfer flows, risk assessment and the approved CCS.

The sequence below is retained as a practical example SOP. It should not replace your site’s approved gowning procedure.

42-Step Example Gowning Protocol for Grade B Entry

1. Enter the Grade B buffer/change area according to the site entry procedure.
2. Remove lower-grade work shoes and place them in the designated location.
3. Enter the sterile gowning room or designated higher-cleanliness changing zone.
4. Disinfect hands using the approved hand-disinfection method.
5. Select the correct size of sterile gown, eye protection and sterile footwear.
6. Place packaged gowning items on the designated clean surface or isolation bench.
7. Disinfect hands again before opening sterile garment packaging.
8. Open the sterile gown package without contacting the outer garment surface.
9. Handle the gown only by approved inner contact points.
10. Open the zipper or fasteners while avoiding contact with the garment exterior.
11. Orient the garment for donning without allowing it to touch the floor.
12. Insert one leg carefully while maintaining control of the garment.
13. Insert the second leg without allowing the garment to contact uncontrolled surfaces.
14. Raise the upper garment while using a mirror where provided.
15. Insert arms into sleeves using the garment’s approved donning features.
16. Position the hood/head covering so all hair, including facial hair where applicable, is enclosed.
17. Adjust the garment using only permitted contact points.
18. Close the primary zipper or front fastening.
19. Secure collar or neck fasteners as designed.
20. Disinfect gloved hands as defined by the site SOP.
21. Remove the sterile mask from its package by permitted handling points.
22. Position the mask without touching unapproved surfaces.
23. Fit the mask to cover the required facial area with no obvious gaps.
24. Disinfect gloved hands.
25. Remove sterile eye coverings or goggles by the strap or designated handling point.
26. Position and secure eye protection in front of a mirror where provided.
27. Disinfect gloved hands.
28. Open the sterile footwear package and handle the footwear from the permitted inner surface.
29. Open footwear closures fully before insertion.
30. Insert the first foot into the sterilised boot or over-boot.
31. Secure leg and footwear fasteners according to garment design.
32. Close the footwear zipper or closure using approved pull tabs.
33. Secure any final snap or closure.
34. Cross the barrier bench with the first fully gowned foot onto the cleaner side.
35. Keep the second foot from contacting the cleaner floor before footwear is applied.
36. Don the second sterilised boot/over-boot using the same controlled method.
37. Perform a mirror check for exposed skin, loose closures and incorrect gown positioning.
38. Perform any approved garment-surface disinfection step only if specified by the validated site SOP.
39. Don the outer sterile glove layer where required by the gown configuration and site procedure; ensure sleeves are correctly contained.
40. Disinfect outer gloves according to the site procedure.
41. Confirm gowning is complete and all required checks have been passed.
42. Enter the Grade B area through the personnel airlock using the approved door-opening and interlock procedure.

Five Principles That Matter More Than the Exact Step Count

• Use a controlled written procedure. The sequence should be defined, trained, version-controlled and followed consistently.
• Protect the sterile garment exterior. Avoid touching outer surfaces and prevent the gown from contacting the floor.
• Control transitions. Barrier benches, personnel airlocks and hand/glove disinfection steps should support movement from lower to higher cleanliness.
• Verify gown integrity and fit. The garment must be clean, intact, correctly sized and correctly worn.
• Qualify the operator, not just the garment. Grade A/B access depends on training, gowning assessment and ongoing qualification.

How Often Should Grade B Gowning Be Requalified?

EU GMP Annex 1 states that compliance with aseptic-gowning procedures should be confirmed by assessment and periodic reassessment at least annually. The assessment should include both visual and microbial evaluation. Facilities may use a more frequent schedule based on risk, trends, deviations or internal quality requirements.

How Gowning Fits Into the Contamination Control Strategy (CCS)

Annex 1 requires a facility-wide CCS that identifies critical control points and evaluates how design, procedures, technical controls, organizational controls and monitoring work together. Gowning is therefore one control among several: personnel flow, airlocks, garment systems, environmental monitoring, cleaning and disinfection all interact.

For cleaning-tool selection by GMP zone, see MIDPOSI’s دليل اختيار درجة ممسحة غرف الأبحاث GMP. For a procurement-focused review of system components, sterility options and supplier documentation, see the إطار تقييم مشتري نظام ممسحة غرف الأبحاث.

أسئلة مكررة

Primary References

• European Commission. EudraLex Volume 4, EU GMP Annex 1: Manufacture of Sterile Medicinal Products.
• European Commission. EudraLex Volume 4 – Good Manufacturing Practice Guidelines.