Formulated to specifications shown per ANSI/ASHRAE Standard 52.1 and 52.2. Designed for testing filters and components of heating, refrigeration, and air conditioning systems.
| Type | ASHRAE #1 |
| Standard | ANSI/ASHRAE 52.1, 52.2 |
| Composition | 72% ISO 12103-1 A2 Fine, 23% Powdered Carbon, 5% Milled Cotton Linters |
