How to Position an Air Purifier in a Bedroom

Give the unit clear space: roughly 1 to 2 feet from walls and furniture on the intake side, off the floor if the intake is low, and somewhere the clean-air path passes the bed rather than the corner of the room. Placement can matter as much as the CADR rating.

• A blocked intake reduces real airflow, so the unit behaves as if it had a lower CADR.
• In a corner, the unit recirculates the air it just cleaned and mixes the room poorly.
• Guiding the clean-air stream along the room helps the whole volume mix, not just the spot in front.
• Placing it right next to the bed can be too loud and too drafty at higher speeds.

1. Pick a spot with clear space on all sides, ideally near a wall but not tight against it.
2. Note which side takes air in and which throws it out; face the outlet along the room, not into a wall.
3. Aim the clean-air path so it passes the bed or the centre of the room.
4. Keep it off the floor if the intake is low, so it is not pulling in dust near the carpet.
5. Avoid curtains, bedding and furniture within a foot of the intake.
6. Run a higher speed while you are out and a lower, quieter speed at night.

• Inside a closet or cabinet, where it will starve for air.
• Directly behind a curtain or a bed headboard.
• Tight against a wall or in a tight corner.
• Next to a radiator, heater or in direct sun.

For sleep, a smaller unit close to the bed at low speed is often quieter than a large unit across the room at high speed. If odor is the issue, keep some ventilation in the room; a particle purifier alone will not remove gases. Follow the model's clearance guidance in the manual.

U.S. EPA, Guide to Air Cleaners in the Home; manufacturer placement and clearance instructions.