I fabricated a quick simple burner for my new small furnace. I had a small squirrel cage fan laying around that used for the air source, not sure on the specifications, runs on 110v. The outlet was 1.25" X 2.5". I made a transition out of 18ga sheet metal and welded this together. The transition was down to a 1.25" square. I took a small length of SS 1.25" tubing and formed a square at the end. I then took a 1" SS tube and flared the end to 1.25" to transition to the larger tube. TIG welded this all together and screwed it to the fan. I found I needed the flare even inside the furnace as the flame would keep blowing out. For the fuel inlet I made a 1/4" NPT bung to weld to the 1.25" tube. I then took a 1/4" pipe nipple and threaded the inside both ends to 1/8" NPT. This allowed me to thread the propane hose adapter on one side and a plug on the other side. I drilled a #57 hole in it, same as the Reil burner or Oliver upwind burner uses. I purchased an adjustable regulator so I can adjust the fuel amount, surprisingly it does not use much pressure as I though that it would.