Most paint-quality problems blamed on guns, paint or painters are actually filter problems. Dust nibs come from a tired ceiling; falling airflow comes from a loaded floor; solvent smell outside comes from spent carbon. Here is a realistic change schedule for a booth in daily use.
Floor / Exhaust Paint-Stop: Every 50–100 Booth-Hours
The fiberglass arrestor in the floor pit or exhaust wall is the fastest-loading filter in the booth. As it fills, extraction drops, overspray hangs in the air, and finish quality follows. A busy body shop changes it every two to four weeks; a furniture line spraying heavy lacquer may need weekly changes. The tell: paint mist drifting instead of being pulled down.
Ceiling Media: Every 6–12 Months
The full-ceiling F5 layer fails invisibly — it still looks white while its tacky face has stopped holding fines. If nib counts creep up job after job with no other change, the ceiling is due. Never vacuum and reuse it: cleaning breaks the fiber structure and turns the filter into a dust launcher.
Intake Pre-Filters: Monthly-ish
G3/G4 intake pads are the cheap sacrificial layer that keeps the ceiling alive. Change them at double the clean pressure drop, or monthly by default. Skipping this change doesn’t save money — it just transfers the load to media ten times the price.
Carbon Exhaust Pads: When Smell Returns
Where booths exhaust near neighbors, a carbon cotton stage trims odor — until the carbon saturates, which your nose reports before any gauge does. Budget a change every one to three months depending on solvent load.
Make It One Order
The economical pattern is a per-booth kit: a year of ceiling media, a season of floor rolls, a stack of intake pads and carbon as needed, cut to your booth’s sizes and delivered in one carton series. Send your booth dimensions to jinhaofeng298@163.com and we will spec the kit and the reorder cycle.