Get a metal cap plug for inside the house. A small length of 1/2 inch PVC pipe with a threaded end and a cap. A can on lighter fluid and one of those electric start click lighters or
Drill a hole in the plug.
Connect a small 1/2" threaded PVC pipe to the hole. In the cap make a small hole and attach the starter from the lighter to it.
Spray some lighter fluid into the duct (be conservative)
Actuate the starter.
Remove the setup and act like nothing happened.
1. Get a metal cap plug for inside the house. A small length of 1/2 inch PVC pipe with a threaded end and a cap. A can on lighter fluid and one of those electric start click lighters or
2. Drill a hole in the plug.
3. Connect a small 1/2" threaded PVC pipe to the hole. In the cap make a small hole and attach the starter from the lighter to it.
4. Spray some lighter fluid into the duct (be conservative)
5. Actuate the starter.
6. Remove the setup and act like nothing happened.
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