Maintenance · full routine

The complete CR box maintenance routine

If the basics are the what, this is the when. A simple schedule keeps a CR box performing like new.

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Weekly

Glance at airflow and the filter faces. In dusty or pet homes, a quick vacuum of the intake surfaces.

Monthly

Run your hand around the seams with the fan on and re-tape any leaks. Check the fan is clean and spinning freely.

Every 6–12 months

Replace the MERV-13 filters (sooner if airflow has dropped). Wipe down the fan blades and housing. See the replacement schedule.

Seasonally

Before pollen or wildfire season, fit fresh filters so you start the heavy period at full capacity — see seasonal maintenance.

Related guides

guide
Troubleshooting

Fix airflow, noise, leaks.

guide
Build instructions

Build it right.

tool
Filter reminder

Estimate your change date.

Frequently asked questions

What's a good maintenance schedule for a CR box?

Weekly: glance at airflow and vacuum intakes if dusty. Monthly: check seams and the fan. Every 6–12 months: replace filters. Seasonally: fresh filters before pollen or smoke season.

Do I need to clean the fan?

Yes, occasionally — wipe the blades and housing when you change filters, as dust on the blades reduces airflow and adds noise.

When should I replace filters as part of maintenance?

Every 6–12 months, or sooner if airflow drops. Fitting fresh filters before pollen or wildfire season is a smart habit.