Summary of clause 4 T 23
Requirements (Recommendations)
Ensure protection of the product
Allow efficient cleaning, sanitizing, if necessary, and maintenance
Minimize the risk of mix-up
Base decisions on the design of the premises
Provide separate areas
Provide sufficient space
Define the flow of materials, products and personnel
Design or construct floors, walls, ceilings and windows in production areas
Keep floors, walls, ceilings and windows clean in production areas
Do not open windows
Protect properly windows with a screen
Allow for proper cleaning and maintenance
Include, if necessary, smooth surfaces
Allow for resistance to corrosive cleaning and sanitizing agents
Provide for personnel adequate, clean, washing and toilets facilities
Differentiate toilet and washing facilities from production areas
Provide adequate facilities
Install adequate lighting in all areas
Install lighting in a manner to ensure containment of any debris
Take measures, if necessary
Provide adequate ventilation
Take specific measures, if necessary
Install pipework, drains and ducts
Keep drains clean
Take into consideration when designing ...
Maintain premises in a clean condition
Carry out cleaning, and, if necessary, sanitization
Use cleaning, and, if necessary, sanitizing agents
Have cleaning and, if necessary, sanitization programs
Maintain premises in a good state of repair
Use appropriate consumables for production and storage premises
Design, construct and maintain the premises in such a way as to limit the access of parasites
Establish a pest control protection program appropriate for the premises
Take measures to control the exterior of the premises
Processes 
Clean and sanitize premises and equipment
Maintain infrastructure
Procedures 
Maintenance
Records 
Room cleaning and sanitization program
Intervention report
Premises maintenance program
Pest control measures