Very detailed article on furnaces and their cleaning

I found on my furnace the rubber gas line was long enough to reach outside to sawhorses I had the furnace on once I removed it. I bought a 4 prong trailer light plug and connected that into the furnace wiring to make unhooking easier. Now I can unplug/disconnect, remove furnace, place it on the sawhorses, reconnect and easily see it work. While I had it out, I lined the intake air plenum chamber area with automotive underhood sound deadening mats and considerably reduced the noise of the furnace.