Is media blasted residue harmful? Options

[914itis]

My car was soda media blasted I think ( its the white stuff that looks like baking soda) before I got it and went on with the restore. There was powder everywhere. I cleaned all the visible residues before restoration and paint.

For the first time, I completed the installation of the heating system last month. As I had the heat on with the fan blowing, I noticed the soda smell coming out of the vents.

Can the smell do any harm?
What is the best way to clean the heat tunnel?

I don't think there is much in there, I uses a vac to blow and suck the dust before installation. Can I just detach the hose coming from the firewall / long to the flappers. Them disconnect the hose behind the speakers and water hose it ? What would you suggest?
All opinions welcome.

[Mblizzard]

If you can't get any information from the blaster some things may help you figure out what it is. So what is below is for informational purposes only. While these are simple actions, you should only evalute them further if you receive additional guidance as to the potential risks and you feel that you have a complete understanding of the process and the risks involved. While the risks are likely low, there is no way that any reasonable person could anticipate any and all potential risks associated with the what is presented below.

So after all of that, If some of the media from the car happened to be in two glass jars.

One might slowly add water to one of the jars until there was have about 10 times as much water as media then stir. If the media completely dissolves then it is likely soda. If some dissolves and some does not the you likely have a mix of media. Some of the material removed from the car mayfloat or sink. But the removed material will be irregularly sized and should resemble dirt. Any other Material at the bottom of the glass that has a more uniform size may be a media other than soda.

In a well ventilated area one could take 1 drop of vinegar and place it on the media in the second jar. If it is soda media it will fizz. But just as was stated previously, the media may contain numerous other contaminants so don't inhale the fumes.

If vinegar is added until all fizzing stops, only small particles of the paint and dirt that was removed from the car should be viewable. If there are a lot of uniform particles remaining then another media other than soda may be involved.

Of course the only way to be completely sure of what the media is composed of is to have it tested by a certified lab.