How to measure your condo filter size.
Measure the filter’s outside width, height and depth in inches, and record the printed size separately. Match both the actual dimensions and the equipment specification. Do not round a measurement or substitute the nearest listed size without confirming the fit.
Nominal size and actual size are different fields.
A nominal size is the size label used to identify a filter. Actual dimensions describe its measured outside size. The difference is product-specific, so do not apply a standard deduction to every nominal size. A filter marked 16 × 20 × 1 is a label to check against its actual dimensions, not a promise of exact measurements.
Your measuring checklist.
- Follow the unit’s instructions to isolate power and access only the resident filter compartment.
- Photograph or write down the filter label, type, rating and any part number.
- Measure across the outside frame from edge to edge for width and height.
- Measure the outside thickness; record fractions or decimals accurately.
- Compare the replacement’s actual dimensions and specification with your equipment requirements.
Keep all three dimensions.
For example, “14 × 25” does not tell us the depth. A deeper pleated filter is not interchangeable with a shallow panel just because the face dimensions match. A pad’s thickness and specified media also matter, particularly for a separate HRV or ERV.
What if the filter is damaged or missing?
A bowed frame can give misleading measurements. Use the equipment model and approved replacement specification, or ask building management for the correct part. Do not reach into the unit to measure an inaccessible rack or infer a filter size from a return-air grille.
When a custom size needs review.
Send the full dimensions, whether they are nominal or actual, the unit make and model, and any filter part number. Mention special frame shapes or retainers. We confirm the specification, price and lead time before completing a custom order. Custom sizes can take longer than the usual 3–5 business day delivery estimate.
Use building search as a starting point.
A recorded building size can narrow the options, but neighbouring suites may use different equipment. Confirm your installed filter before ordering. Dedicated ventilation filters should be identified by the HRV or ERV model and specified part, not size alone.
Have your measurements?
Search the shop by size. If you cannot find an exact match, send an inquiry instead of choosing a near match.
Shop by filter size →