On Thu, 15 Feb 2007 06:39:33 -0600, DK wrote:


You have to use the candle test to determine if they are working.
Watch the smoke when holding the candle in front of the exit vent.


Use an incense stick for smoke. You can even close the fireplace door
to watch. . A fan will blow out the candle and the fireplace flame may
melt the wax..