A ceiling or intake filter that's even slightly undersized leaves gaps — and unfiltered air takes the path of least resistance straight into your spray zone. Getting the size right is the difference between a clean finish and chasing dust nibs. Here's how to measure.
Measure the Opening, Not the Old Filter
Old filters shrink, stretch, and compress. Always measure the actual filter opening — the ceiling plenum or filter grid that holds the media — not the used filter you're pulling out.
How to Measure a Ceiling / Intake Filter
- Measure the width and length of the filter opening in inches.
- For a multi-panel ceiling bank, measure one bay and note how many bays your ceiling holds.
- Write down width × length (e.g., 38" × 107") and the quantity you need.
Bag, Pocket & Roll Filters
For exhaust bag/pocket filters, match the frame opening (width × height) and pocket depth. For roll media, you only need the width — you cut it to length on site.
Standard Size or Custom-Cut?
If your measurement matches a common size, shop your booth brand's filters. If it doesn't — common on legacy or modified booths — we custom-cut ceiling blankets to your exact dimensions.
Let Us Confirm It
Not confident in your measurement? Use Find My Filter or send us a photo of your booth tag and filter opening, and a technician will confirm the right size before you order.