As stated previously I am trying to build air heaters for a minimum dollar amount to give away to folks who want to save money on utility bills. Following is a list of terms I use to search for materials in the free section on Craigslist.
1 x 6
2 x 4
I have collected several tempered glass shower doors in the last week, a bunch of open cell foam although that may not be the best for these heaters, and a fair amount of 1 x 6 redwood fence slats. The slats are usually only five and a half to six feet long but for the price(free) they can easily be spiced together to make longer boards. Same thing with pallets.
Please feel free to ask questions as to why I search for certain terms if it doesn't make sense to you. And If you have terms that I overlooked, please add to the list. Thanks.