Expertise about ventilation problem in condo

Hello,
A friend of mine recently bought a condo. When the woman two floors below fires up a cigarette (which is pretty much all day), the smoke smell comes into my friend's condo. There are at least four ways it's getting in, based on sniffing when the apartment's windows are open and it's well aired out:
- fireplace - bathroom fan vent (it's worse when the fan is on!) - cabinets in kitchen (probably from the space where the pipes come into kitchen) - fuse box in laundry area (probably from where the wires enter the floor below).
Home inspectors are not the best people to say how much this kind of thing will cost to fix, nor how it should be fixed. Most inspection web sites I've seen only speak of separate issues (wiring, plumbing, structure, etc.).
The contractors that have looked at the problem all suggest a different patch to apply (foam insulation, air filters, etc.), with his own estimate and no guarantees. There has even been one that has proposed repainting with special tobacco-resistant paint!
It's frustrating that nobody has a clue about the real source of the problem that allows the smoke to get in. By the way, the woman has the right to smoke in her condo - no way to make *her* stop. Anyway, if she cooked cabbage all day, it would likely be just as annoying.
What kind of inspection would reveal the weaknesses in the construction of my friend's condo? Clearly it's not normal! Other tenants in the building have complained, too.
I'm hoping the HVAC readers out there can lend a hand in expert advice. What are experts for this kind of problem called? My friend needs to contact an expert. We phoned the city and they have been no help.
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Start with something like this: http://www.eere.energy.gov/consumer/your_home/energy_audits/index.cfm/mytopic190 Bubba
wrote:

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I know of one company that specializes in this type of work, however they are located in Southern California.
http://www.machadoenviro.com/NewIAQInvest.htm
http://www.iaqa.org/consumer_information.htm
Look for commercial companies that deal with indoor air quality issues, mold, etc. Forget about heating & ac contractors providing a solution & warranty, thats not their cup of tea.
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One thing a good indoor person will come equipped with is titanium chloride "smoke" tracer equipment.
With the cooperation of the tobacco user in the floor below, the technician can create a really dense plume of non-toxic chemical smoke at the "source", then trace its path both visibly and with chemical detectors. The method can find really _tiny_ leaks effectively. HVAC folks use them for ductwork leak detection (duct deduction<G>).
They aren't controlled materials, so you could buy them from a good industrial supply (like MSC or McMaster-Carr), if so inclined. They're small self-contained kits in most incarnations -- no chemical expertice necessary.
Another item that might be useful is a thermistor based air-flow meter. It can sense almost microscopic air movements in tight locations, like around pipe/electrical penetrations in sill plates and wall caps. 'works kind of like an electronic refrigerant leak detector -- gives out a tone that varies as air motion is detected.
Of course, the human nose is so sensitive a detector, that the amount of tobacco smoke necessary to be objectionable might amount to a leak so small you never can find it.
LLoyd
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