Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Can this ladder be used on staircase to access air return filter?
Document: I bought this ladder and after having used it for about a week, decided to return it and upgraded to a Little Giant. First, the ladder was covered with a black dust that rubbed off on the clothes and hands. The Little Giant hasn't had that problem. Second, the hinge is enclosed and I cannot see that it's not locked unlike the little giant. The mechanism works with a dial while the Little Giant has a push knob, which I found easier to use.
I bought this ladder on the basis of Amazon web site only. I should have paid a visit to Home Depot first to actually look at different ladders first. I'm a senior citizen and this ladder is just too heavy for me to be functional. I realize I could return it but it's just too much aggravation so I'll just keep it but... I would not recommend it to anyone with exception of perhaps commercial users.
Stable as a step ladder. It is a little heavy for me, but not impossible to carry. It is nice to have a ladder that can be used in multiple positions. It is a little pricey, but getting it delivered to my home make is easier.
Too easy! This is an industrial grade ladder. It's built to a high quality level meant for serious, daily use. If I were a professional painter or roofer, etc. I'd get this ladder. Of the 3 (Werner, Little Giant, and Costco) this Costco is the least expensive. I actually found mine at Walmart and it looked like it had been a little scuffed up from shipping and warehousing. At first, I couldn't tell if it had been a return.
Awesome ladder. Extends easy and is very sturdy. Used it on a variety of projects around the house to include installing a ceiling fan. Didn't ever feel like I was going to fall from it or wobbly. Light weight and doesn't take up a lot of space. Great price, and great product.
I bought this for my husband for his birthday. So far, the ladder seems easy to use for him...for me it would be difficult to use by myself just because of the size of the ladder. It folds up nicely and is easy to store. We have used this ladder for replacing lightbulbs inside the house, cleaning the gutters and putting up Christmas lights outside the house.Very versatile and functional for a homeowner!
Recently purchased this ladder and am very happy with it. I've used the Little Giant in the past and loved its versatility and came across this ladder while researching it. There are some knocks on this ladder that it makes your hands dirty when handling it and it does but it's not bad and something I'm willing to put up with at about 60% less than the name brand version. Ladder is very steady and can be transformed from one configuration to the next quickly and easily.
I've wanted one of these all-in-one ladders for awhile now. Finally got one and I used it 7 times on the first day I got it. I got the 17' version (there is a 22' available but I didn't need that much height). I compared this ladder with the Little Giant and the Werner. Bottom line: This ladder less expensive than the ladders offered by those other 2 companies. Is that because this ladder is made in China?
Pro's:  Can be used in many ways. Will replace my 8 foot step ladder and I needed a 10 foot step ladder and an extension ladder and now I have one. This is my second ladder and it is much more sturdy than the first one (the first one looked like it had been well used and then returned).Con's:  This thing is heavy. It is a bit awkward to move around. Hands get dirty because of the aluminum. I do not think this is necessary.
I first saw all the ads on TV for the little giant. I work maintenance at a couple of Fitness Clubs at night and needed a secure, versatile ladder for high ceilings, stairs, etc. and considered buying one. Then I saw the Cosco brand for half of Little Giants and purchased it for the same price as above. I have used it now for 3 years and love it. Expecially for high places, I feel more secure on it than a lot of extension ladders I've used in the past.
Answer: yes