Top positive review
38 people found this helpful
Made in Sweden
on April 13, 2011
I am extremely pleased with the Blueair 450E. It is very quiet and very effective. It is so sensitive in auto mode that punching a dusty pillow on the other side of a 15-foot room will soon start it running. So, I just keep mine set to auto.
I used the smoke-type filter once. It left little black particles throughout my residence.
UPDATE 02/19/2012: I did some remodeling in my apartment during which my 450E ingested substantial amounts of spackling dust. The auto-mode stopped working. It sounded as though it were trying to reduce power to medium setting, yet remained on high constantly. I used a small soft brush to clean the sensor screen which is about 60mm x 15mm and located at the outlet end. This did not cure the malfunction. I dipped the brush in denatured alcohol then tried, gently, poking a little, to get the bristles of the brush through the mesh opening. (The mesh is not rigid.) Finally, I set the machine with outlet side up, then poured 2 fl. ounces of the denatured alcohol through the mesh, which then soaked the sensor element. I waited 30 minutes. Works like new!
UPDATE 10/26/2013: The dust sensor finally clogged; which means the unit has lost the ability to auto-adjust speed in accordance with dust in the air. Compressed air will not free the particles from the sensor. Sent an email to the company, requesting a source for the part.
FINAL UPDATE 10/30/2013: Blueair did not respond to my email.
Several repair hints from my experience:
Use 1/8" drill bit to remove rivets used to assemble case.
Remove gray plastic box fixed to the top rear of the unit.
There are two air sensors in the gray box:
>>> Figaro Odor Sensor, Part No. TGS 2600
>>> Sharp Microelectronics Dust Sensor, Part No. GP2Y1010AU0F
The odor sensor circuit board is attached to the box by two screws.
The dust sensor is a small rectangular box attached with glue.
It angers me that Blueair used pop rivets rather than screws to assemble the case.