Why choose a CSIA Certified Sweep?
What you are looking at is a liner installed by handyman type contractor. Someone who is not certified by the Chimney Safety Institute and obviously does not know the codes the principles of venting. The issue is that the liner is drastically undersized for the fireplace. Every time the homeowner lights a fire, their house fills with smoke. Now the homeowner, who has already paid 3k to have this installed, will now need to pay at least 2K to have it removed.
Our advice, do it right the first time with a company that specializes in this type of work.