Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Are they suppose to go in the returns or the vents?
Document: We have been using these for a few weeks now and have noticed a huge difference in our daughter. Prior to installing these she would sneeze as soon as the heat kicked on. Very seldom now does she let out a sneeze and most of the time it's after the heat has been running for a while.For the Price you really can't go wrong. They fit perfectly in our vent covers we have some smaller ones and just simply cut an inch or so off and fit perfectly in those too.
I have been using these in all of my vents, and they filter the air very well. I recccomend them to anyone with allergies.
This item had to be cut in order to fit my vents. It seems to reduce the amount of warm air coming out of the vent.
These didn't catch as much debris as I thought they would. Save your money and just change your furnace filter. They look sort of tacky in the vents too.
I got the product very quickly. They fit well in the vents after a little bit of trimming (just off the end), have one in every vent in the house.
I sue these filters in the floor vents and they really make a difference keeping outthe dust. Even though you have a filter on your furnace these filters add just thatmuch more protection. Would recomment.
These vent filters would have been great to use in my vents to keep the dust and a lower level but I did not take notice of the size of my vents in my house and these did not fit so I had to return them. Very easy to return to the seller
These are a good fit, being a little longer for a larger vent. It is much easier to cut a little off rather than having to cuta piece off of another one to fit a larger vent. My place has different sized vents.
I had a hard time getting these to stay up in the vents. They shifted and fell and had to be taped which still didn't hold well. The air quality didn't seem to change so I doubled to 2 thick per vent and still no notable improvement in a weeks time...so, took them out and tossed...
Just another way to add protection. Also great for renters. Moving into a new place usually the maintenance crew doesnt care about the place since they dont own it. They let all sort of junk fall into the vents. Then you move in and the air is push up right through all the junk. I say a must have for clean living.
Answer: yes