Tracing Air Movement In Ducts

I'm trying to trace warm air through my heating ducts & am looking for some kind of synthetic smoke or color that I can see coming out of the floor registers when I introduce it into the duct from a remote section. Anyone know where I can buy such a thing?

Should be sold at your local HVAC supplier. One brand is:

http://www.bramec.com/search/detail.asp ... a=OR&CATS=

Yanche wrote:Should be sold at your local HVAC supplier. One brand is:

http://www.bramec.com/search/detail.asp ... a=OR&CATS=

Thanks for your reply. Anyone ever use any of these smoke emitters to check airflow in ducts?

Just sent away for these smoke emitters:

http://testproducts.com/safecart/produc ... cts_id/162

I'll report back when I get them.