USI 8-Pocket Bag Filter – 23.5x46x8 Polyester – Fits USI Master & Chronotech – 4-Pack

More media in the airstream means fewer changeouts and less booth downtime for USI Master and Chronotech booths. These 8-pocket bags are sized 23.5 x 46 x 8, come four to a box, and are covered by our fitment guarantee.

The USI 8-Pocket Bag Filter is a G4 prefilter and exhaust filter for USI Master spray booths. Built from dual-ply polyester media with a galvanized steel header, its uniquely formed 8-pocket design maximizes paint-holding capacity while maintaining consistent airflow. Sold in sets of 4.

Pocket filters load from the back of the pocket forward, which is why an 8-pocket design outlasts a flat panel or a 5-pocket bag of the same face dimensions — there is simply more media in the airstream before the surface blinds over. In a busy collision shop running several cycles a day, that difference shows up as fewer changeouts and less downtime with the booth offline.

Key Features

• Dual-ply polyester media: 93.5% average arrestance and 662 g/m² dust loading capacity in testing.
• 8-pocket design: expanded surface area maximizes paint collection and airflow.
• Galvanized steel header: rigid, secure, easy-to-install frame that resists corrosion in humid exhaust air.
• Dimensions: 23.5 x 46 x 8 inches.
• Pack quantity: 4 filters per box.

Best For

• Prefilter and exhaust overspray capture in USI spray booths
• Automotive refinishing and collision center finishing
• High-volume production paint operations

Compatibility

• USI Master 7 Meter
• USI Master 8 Meter
• Also fits USI and USI Italia Master and Chronotech booths

Usage & Care

Watch static pressure rather than the calendar. As the pockets load, the booth fan has to pull harder to move the same volume of air, and a booth that cannot hold its designed airflow starts drawing unfiltered air through door gaps and seams — which is where nibs in the finish come from. Replace when your gauge shows a sustained rise over baseline, or on a set schedule if you do not monitor pressure.

Change all four at once. Mixing a fresh bag with three loaded ones sends most of the airflow through the new filter, which then blinds over early and puts you back where you started.

Test Data

G4 bag media: 93.5% average arrestance, initial pressure drop 33 Pa (0.13 in. w.g.), change at 250 Pa (1.00 in. w.g.), 662 g/m² dust loading capacity. Tested to ISO 16890-3 and EN 779:2012 by the manufacturer, August 2026.

Download the spec sheet (PDF)