Free cleanroom layout blocks for AutoCAD (DWG): ISO classes, HEPA and FFU, airlocks, isolators, sampling grids

About the standards and the sizes

The air cleanliness classes ISO 1 to 9, the designation with occupancy state and particle sizes and the number of sampling locations for a room area follow the classification of cleanrooms (ISO 14644-1). The airflow and segregation concepts follow the ones described for the design of cleanrooms (ISO 14644-4), and the separative devices and the transfer device types A1 to F follow the classification of separative devices (ISO 14644-7). These standards are named only as the usual references; the plan symbols, sizes and layouts are common practice, for example a 610 x 610 mm HEPA terminal or a 1175 x 575 mm fan filter unit. Pressure differences, air change rates, filter classes, air velocities and the number of airlocks come from your specification and the rules you work to.

The blocks are our own drawings, simplified to what matters on a plan, and the library is not certified. A class label is an annotation: a room is only ISO Class 5 or 7 after it has been tested and classified. The library helps to draw and schedule a cleanroom, it does not prove that a design meets ISO 14644, GMP or any other rule. Check the standards and regulations that apply to your project and have the final design reviewed by a competent person.

Frequently asked questions

Which items are in the library?

Air cleanliness class labels, sampling and monitoring, air supply and return, airflow and pressure, contamination control concepts, personnel and material flow, separative devices, transfer devices, cleanroom construction, rooms and layouts and 4 tags. The page above lists every group with its count.

Are there sampling grids for the number of locations that a room area needs?

Yes, there are grids for 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 20, 24 and 27 sampling locations. Each grid has the largest room area that needs that number of locations, divided into equal square sections with one location at the centre of each. They help to plan the sampling; the number of locations and the method are set by the edition of the standard you work to, so check them before the room is tested.

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

Does a class label make a room an ISO class room?

No. A class label only records the class that the room is designed for or has been classified as. The class is determined by particle counts measured in the room in the stated occupancy state, so the label has to follow the test report and the specification of your project.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.