Slotted Back to Back 1-5/8 in x 3-1/4 in Strut Channel, Pre-Galvanized Steel, 12 ga., 10 ft/ BODY DIAMETER: 2.188 INCHES NOMINAL BODY THICKNESS: 0.250 INCHES NOMINAL DESIGN TYPE: REUSABLE TEMP RATING: -40.0 DEG FAHRENHEIT MINIMUM AND 250.0 DEG FAHRENHEIT MAXIMUM FILTERING MEDIA DESIGN: CELLULAR SINGLE FILTERING MEDIA RESPONSE MATERIAL: PLASTIC UREA-FORMALDEHYDE FILTERING MEDIUM STYLE DESIGNATOR: A3 ROUND