Filter replacement
Aprilaire 201 Filter Replacement Steps
Aprilaire cabinets are labeled with a filter number. #201 is not the same rail as #213. Match the door label, expand the media fully, and latch the door for a seal.
Updated July 2026 · 4 min read · Canada
Symptoms
- Door says filter #201
- Media dark past a year
Likely causes
- Wrong media number ordered
- Overdue change
What to do
1. Confirm the door says 201
If it says 213 or 216, use that guide instead — the media widths differ.
2. Replace and align the arrow
Expand in the rail, arrow with airflow, latch the door.
Stop and call a pro when
- Rail is bent and media will not seat
Related guides
- Aprilaire 213 Replacement — How to replace an Aprilaire 213 media filter in 2210/4200/2200-series air cleaners, including orientation and change intervals.
- Aprilaire 216 Replacement — How to replace Aprilaire 216 media in 1210/2210/3210/4210-series cleaners with correct orientation and buy links.
FAQ
Can I use 213 in a 201 cabinet?
No. Different width/rail specs cause bypass or a filter that will not close.
Need a licensed tech instead?
If the guide says to stop — or the part swap did not clear the fault — get free quotes from licensed local HVAC contractors.
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