IVE MADE ABOUT 9 OR 10 OF THESE HEATERS AND I FOUND YOU DONT NEED TO GLUE CANS TOGETHER OR HAVE HEADERS TO MAKE HEAT YOU JUST NEED A BOX WITH OPENING IN THE TOP AND BOTTOM FILL IT WITH SOME KIND OF METAL TO COLLECT HEAT AND COVER IT WITH PLASTIC OR GLASS THATS ALL YOU NEED ALSO I DONT FEEL YOU NEED TO HOOK UP COLD AIR RETURN FROM YOUR HOUSE JUST USE THE FRESH AIR THAT WAY THERES NO BACK FLOW AT NITE if you watch all my pop can heater videos you will see the different ones ive made and tested you can judge for yourself good luck rich
Post time: Jul-01-2017