CleanMax Secondary Filter - Carpet Pro CPU/Titan

CMPS-SF is the secondary filter for Carpet Pro's commercial upright vacuums. On this class of machine a secondary filter is the stage behind the primary one, there to hold what the first stage lets through before it can reach the motor. It reaches across a wide swath of that lineup: the CPU-1T and CPU-2T models it was originally named for, the broader CPU and CMP-3 family, the Clean Max CMPS-QD, Fuller Brush's FBHD and FBMM uprights, and Titan's T4000, T4000.2, TC6000 and TC6000.2.

Because a secondary filter is buried out of view, it ends up as the maintenance item nobody thinks to touch. A machine wrongly diagnosed as needing a new motor has frequently just spent a year or two pulling air through a gray mat of trapped dust: the bag checks out fine, the belt checks out fine, and pickup has slipped by half without anyone tracing the cause.

• Part: CMPS-SF, secondary filter
• Fits: Carpet Pro CPU-1T, CPU-2T, CPU-1QD, CPU-3N, CPU-3QD, CPU-4N, CPU-4T, CMP-3N, CMP-3QD, CMP-3T; Clean Max CMPS-QD; Fuller Brush FBHD1, FBHD1T, FBMM1T; Titan T4000, T4000.2, TC6000, TC6000.2
• Replace: on a six-to-twelve-month cycle for a unit run daily

Airflow returns as soon as a fresh filter is seated, which is what makes this a worthwhile check to run before more expensive ones. Building it into a standing maintenance routine avoids the motor complaint that a timely filter change would have headed off entirely. Across a fleet of these commercial uprights, checking every machine on the same fixed day each month keeps the whole group to one standard, rather than letting the newest unit set an unofficial pace the older machines fall behind.