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 — browse pocket and bag filters once you have the header dimension. For roll media, you only need the width — you cut it to length on site from our fiberglass roll stock. If you're replacing the holders themselves rather than just the media, see our filter grids and frames collection.
Standard Size or Custom-Cut?
If your measurement matches a common size, shop your booth brand's filters or browse the full ceiling blanket filters collection. If it doesn't — common on legacy or modified booths — we custom-cut ceiling blankets to your exact dimensions. Not sure which route actually saves you money? See custom-cut vs. pre-sized ceiling blankets, or read the full custom-cut ordering walkthrough.
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.
Get the Numbers, Then Get the Filter
Once you've got width, length, and quantity, ordering is the easy part. If any of the terminology on your booth tag has you stumped, our paint booth filter glossary defines it. Orders placed before 2pm MST ship the same day.
Shop ceiling & intake filters →
Order a custom-cut ceiling blanket →
Not sure of your size? Find my filter →