.• Plumbing blockages.• Exposed and faulty wiring.• An illegally installed and dangerous stove.In the Green case, all of these defects were present, and there also were many violations of the local housing and building codes.

We had a plumber snake the line twice with no blockage.

I recently suffered a drain blockage issue in the basement.

I had a tenant cause a serious plumbing blockage by flushing tampons down the toilet.

Such as having a plumber come out and camera the sewer to make sure that there are no current blockage issues.

(For instance, flush the current pipes to clear out any partial blockages)What options are worth looking into for a separate system?

CO build-up and poisoning can occur if exhaust system has leakage or blockage (or back draft).

If you just want durability and not stain blockage, I'd use a no or low VOC flat ceramic paint.

Note I said proper, a lot of companies do not do all of the following that is recommended.....The vent system needs to be checked for blockage and/or leakage.

     - Check for blockages and remove debris.