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]

Paul,

You have been given some very good and correct information here. If you have true concerns, ask the blaster for the MSDS (material safety data sheet) for the media he used. Or for the brand name and you can find the MSDS on line. This is the only definitive way to determine any potential risks associated with the media. I know that some blasters may mix media depending on the job. I have seen ground glass mixed with soda used at times. But this is usually the exception rather than being a common practice.

I work in the environmental field and deal with these types of issues everyday. If you need additional help feel free to contact me.