Solar Air Heater Comparison! Steel Can Solar Air Heater vs. Screen Absorber Solar Air Heater. see how they compare in side-by-side temp. tests. built effectively identical. (both builds with full instructions can be found on my youtube channel page).
UPDATE: (on 12/4/2017) I just posted a new side-by-side video comparing the Steel Can solar air heater with my newest solar air heater -- the Steel Downspout solar air heater. if interested here's the link    • Solar Air Heater Comparison! - Steel ...  
- here's the links to the full original videos for each of the solar air heaters (w/full builds)...

1.) Downspout Solar air heater...    • DIY Solar Air Heater! - Solar Thermal...  
2.) Steel Can Solar air heater.......    • Homemade "Steel Can" Solar Air Heater...  
3.) Screen Absorber Solar heater....    • Solar Air Heater! - The "Screen Absor...