I'm not sure if anyone can help me in this forum, but I'll describe the problem I'm having...

About 6 months ago, a disgusting, urine-like smell started coming from my heating vents...we rent a house, and live in the ground floor suite, and have neighbours upstairs. The smell is even worse in their suite. We had the landlord come over to check it out, he vacuumed out the vents (?) and found nothing. I don't know if this is a plumbing-related problem or not.... could a sewage pipe somewhere be leaking or something? When we first noticed the stink, we covered all the vents in our place with plastic, and haven't smelled anything since. But now that winter's here, we need to turn on the heat, and the stench will be everywhere...

My neighbour thinks the smell could be coming from urea formaldehyde? (We don't even know if this has been used in this house or not)

anyone know what this could be, or who we would need to call to investigate/fix this problem? Thanks in advance...