Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Can this device be left always on, or will the timer always shut it off?
Document: It's a really good air filter, I would have liked it more with an auto setting, but I do use the timer which works really well. I did however read some reviews about the casing/door at the front. It does need to be secured with tape. I shouldn't have to secure a new device with tape, but I like the capacity that I need for my living room. It doesnt bother enough to send it back though.
I discounted other reviewer comments about the cover not shutting. I assumed that Honeywell was high quality and that these reports were unusual events or people who did not know how to shut the cover. To my dismay, I was wrong and they were right. The front cover will not shut. Very poor product engineering!!!! I contacted their Kaz Consumer Relations who responded that they do not give refunds but stated that I should mail it to them to see if they can fix the problem. You can fool me once ... but not twice.
This product was easy to assemble and operate. I like the timer feature which helps us not have to remember to turn the unit off at the end of the day. I also like the three levels of operation that gives us more control over level we need.
&#34;TURBO&#34; uses a mind number 129 watts. So figure a Kilowatt a day to run it (on low)...so around here that is 12 cents or so...  so $3.50/month...  $40 or so a year (i highly doubt you'll run it non stop for a year)...i do shut mine off at times. I'd imagine in the winter i'll run it less. I mainly bought it for allergy season (fall/ragweed) when I plan on running it a little harder but hopefully for less time.
purified our home air in first day. before the purifier, we had dust floating in our air mostly noticable in direct sunlight. no longer any probs. yes, the high speeds are loud but just set the timer when you leave the house and come home to clean air. we have a two story first floor so alot of air gets pushed thru this machine.
I feel like my air is so much cleaner when I have this in the room. It is slightly noisy, however if you enjoy a little white noise when you sleep it will not bother you. I am a light sleeper and does not bother me at all. It had 4 setting which is convenient and it has a timer if you want it to go off at a certain time (3 different time limits)  It also will remind you when to change the filters.
This HEPA filter does a great job at removing particles and dirt from the air. After running the filter for approximately 6 hours, the evidence of its high performance as dust/dirt/allergen collector could be seen on the pre-filter. I can definitely notice a difference in the air quality after using this unit. The only small negative that does not earn this product 5 stars is the minor annoying left side latch that does not &#34;lock&#34; properly (this problem is noted in other reviews).
The unit itself I really like because it is built for a LARGE room. I have an open floor plan and this works like a dream, I have multiple pets and I also vacuum and dustmop almost daily-the filter on this showed MUCH dust/dander picked up. On turbo it is loud but that is to be expected on any large volume purifier-I have another brand downstairs and it is loud as well. On the reg setting it is very quiet. I would give this 5 stars BUT I had the problem with the front door as well-I just left the little tape on it and it is fine, nothing to scream about.
the sound is too loud. The latch is crap. the rest works so far. But for the price i expected a better fabricated product.
in. of filter media (not counting the ripples!) This is smaller than expected- my Sharp has ~140 sq. in of more densely packed filter media for about 45% of the airflow of this Honeywell unit. I'll update my review if I feel the filters need replacement more often than expected as a result.Yes, it makes some noise at higher fan speeds. It's an air purifier- I'd be more concerned if it didn't! It has a jet-engine like undertone but nothing annoying. I'd rate the noise as acceptable.
Answer: I've left ours on since it arrived a few weeks ago. It has a timer you can activate but by default it will stay on indefinitely.