Wayne Langille's solar hot air collectors.
River John, NS, Canada.

General Details:

• External dimensions approx 4' X 8'
• 6" wide extruded aluminum exterior frame (used in commercial signage) (~$110)
• 3/4" sides and 1" back foiled faced foam board insulation core - Polyisocyanurate Foam Sheathing (John Manville AP Foiled Face)  (~$40)
• 14 - 3" aluminum ducting collector tubes (dryer vent flexible ducting) (~$85)
• Painted with Solkote selective solar coating paint (1L) sprayed on (~$60)
• 1/8" Lexan/Tuffak XL glazing  (~$100-$120)
• Johnson Controls A419 temperature control (~$80)
• 6" Inlet fan, ~150CFM on 5" outlet (Dayton 4WT42A or Fantec FA-6)  (~$50-$110)
• Ducts and foam glued in place with silicon (regular and high heat for top box)  (~$15)
• 3M 5200 Adhesive/Selant to seal glazing to frame.  (~$15)
• Assembly brackets, rivets, etc (~$25)
• Mounting aluminum angle iron 8' (~$35)
• Collector box front aluminum panels ~1/16 10.5"X4' (~$15)
• Total materials cost approx $625-$725 depending on materials used and current pricing.
• All prices are approx in $CDN before taxes.

Heating Performace:

• Under clear bright conditions at mid day typically see a ~40F-45F temperature rise from inlet to outlet (from ~65-70F in to ~100-115F out).  Air is ducted from basement floor through unit and out into basement ceiling.
• Airflow on outlet of ~150CFM
• Typical output of ~5500-7000BTUs output per hour