These pictures and diagrams were provided by Alain in France. They show a nicely made 60 sqft, fan forced ventilation collector. Alain says that this panel resulted in a substantial decrease in last seasons heating energy bill.
Area: 60 sqft
Depth: 4.5 inches
Air Channel depth (each side of absorber): 1.18 inches
(0.4") double wall
collector: aluminum sheet from offset printer
fan: 90 watts
Inlet: diameter 6.3 inches
Outlet: diameter 6.3 inches
The fan is connected on the inlet with a filter for dust (2sqf) and a passive check valve.
Click here for detailed drawings (about 500K)