Gallery: NPPBSPPSB Parts                              © 2001 Randall Hilton all rights reserved. 
       

The exhaust fan sits in the bottom of the box with the exhaust port aimed to the right as you face the box.  

I fastened mine to the bottom of the box with a handful of pop rivets. Self tapping sheet metal screws might be ok too but they'll stick out further from the bottom.

The socket on the 3" test tee fits snugly on the outlet of the fan. I wrapped a bit of duct tape ( use black for that truly professional appearance ) to make it a good tight fit.

Notice that I notched the box so that the smoke hose adapter would align with the test tee. ( You might be able to connect the hose directly to the test tee and save this step. Then, you would be smarter than I was.) I inserted a few pop rivets in trough the back of the box, into the test tee in order to support it. If you decide to connect the hose to the tee, be sure to put a spacer between the tee and the box so there will be room for the hose to slip over the tee.

The hose itself fits nicely over 3" PVC sockets so I made a little extension with a coupling on the end to adapt the hose to the test tee. ( I suppose you could leave out the short extension and just fasten to the test tee but that leaves a rather sharp bend in the hose. What a nuisance.)

On the other end of the hose I use a 3x2 reducing coupling. This fits nicely into most clean out fittings. You might want to wrap a wet rag around the fitting to prevent smoke leaks.

Obviously, you need to connect the appliance pig tail to the fan wiring so you can turn it on. I didn't put a switch in mine but you can if you wish. . . .it's your gadget, you know.

To use it, I simply place the hose into the clean out fitting I'm testing, turn on the fan, and set a Smokey inside the test tee. Then I light the Smokey, lightly screw in the plug and away it goes.

I've built these things in less than 1/2 hour if I have the parts available.