Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: My air handler filter is 21 1/2. By 20 by 1"  where can I find this size?
Document: Profited by the research and reviews posted on Amazon. Furnace service company advised that using filters that are too restrictive can put unnecessary load on the air handler. These are the least restrictive &#34;good&#34; filters that I could find.Recommended them to my son-in-law but unfortunately can not find 20 x 20 x1 size that he need on Amazon.
The MPR metric was developed by 3M engineers to help demonstrate the advantage of 3M filters in capturing the smallest airborne particles-i.e. those from 0.3 to 1 micron in size. The MERV standard however, measures the ability of a filter to capture larger particles using a scale from 1-12. TMI !!!! Let's have just ONE valid and reliable standard which everyone can understand and use!2.
If any of these conditions exist, filters should be replaced MONTHLY.BOTTOM LINE/SUGGESTIONS:1. This is an excellent filter dollar for dollar with acceptable metrics for performance, equipment protection and cost.2. Even without any of the above-cited &#34;special conditions&#34;, I replace our filter monthly. I also leave our fan on &#34;circulate&#34;, which runs the fan continuously and cleans the indoor air better.
This filter is 1/4 inch too big! 20 by 20 should be a unversal measurement. 3M needs to improve quality control!
3M manufactures outstanding filter media in a wide variety of performance metrics and applications. This particular &#34;Dust and Pollen Filter&#34; appears to strike the perfect compromise between protecting your HVAC equipment and fan motor by not restricting air flow through the system with doing a reasonably good job of cleaning the air.2. If you do your research, you will find that this particular 3M 600 MPR filter has the lowest pressure drop (at 0.14) of any 3M filter in the Filtrete line.
I love that I can get my filters here because the size that I need for my air/heating unit is becoming very difficult to find. They are always delivered promptly and in great condition.
My hard to find size air filters were sent in good condition and right away. My fault for not looking a little closer.... The X support cardboard show through my metal vent covers but they are easily cut away and work great without them. I buy in bulk and store the extras in my attic.
Our townhome gives us filters that are super cheap. I went to a local retailer and could not find a good filter in this size. I will continue to buy these filters as needed as long as they are available. They have made a dramatic difference in the amount of dust that has been circulated through our house with the cheaper filters. This product shipped on time and in good condition.
First, I like all the 3M products I have used.This review is suppose to use at least 20 words to describe the how, what, where, when, and how of an HVAC filter. I have found that the lower-rated 3M Filtrete filters work well for me. I had this 600 in my 3-ton HVAC return air vent for 6 months this winter and I could have left it in longer.
I have used these for several years and they are very efficient, just as described, and I found this &#34; hard to find &#34; size.
Answer: yes