How large a room can the 75i handle?

Alen rates it for up to 1,400 square feet, which suits a large living room or an open floor plan. Smaller bedrooms will cycle the air faster than that rating implies.

How often do I need to replace the filter?

Alen's filters typically last around 9 to 12 months depending on use and air quality. The unit's filter indicator tells you when to swap it.

Is it quiet enough for a bedroom?

Yes on low and medium speeds, which most owners find unobtrusive. The highest fan speed is clearly audible.

What comes in the box?

The purifier ships with a True HEPA filter installed, so it is ready to run out of the box. No extra filters are included.

Is $838 a good price?

That is the only new price listed, $838 at ALEN as of November 7, 2026. Without other new listings there is no lower price to compare against right now.