A: The Pure Air Store is one of the largest dealers of furnace filters... I have been purchasing mine for a year and they do tests and case studies with their filters... They clean better than any other furnace filter, plus they always run promotions. Here
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- Honeywell CF100A1009 4-Inch High Efficiency Air Cleaner Filter
Home Improvement (Honeywell)
Price:$19.99$18.98- MERV 8 rating-up to 20x more efficient than typical 1-Inch fiber glass filter
- 16 x 25 x 4.5-Inch
- Captures high percentage of house hold airborne particles, including microscopic particles you can't see
- Filtrete Micro Allergen Reduction Filter, 1000 MPR, 20-Inch by 25-Inch by 1-Inch, 6-Pack
Home Improvement (3M)
Price:$87.92$59.00- For residential use only
- Outperforms fiberglass, washable and non-electrostatic pleated 1-Inch filters
- Lasts up to 3 months
- Honeywell CF200A1008/E 4-Inch Ultra Efficiency Air Cleaner Filter
Home Improvement (Honeywell)
Price:$29.99$19.52- Easily fits Aprilaire/Space-Gard models 2200 and 2252
- Captures high percentage of house hold airborne particles, including microscopic particles you can't see
- No time consuming assembly required. Lasts up to 12-months
- Filtrete Dust and Pollen Filter, 600 MPR, 16-Inch by 25-Inch by 1-Inch, 6-Pack
Home Improvement (3M)
Price:$51.94$40.87- Captures large airborne allergens like household dust, pollen and mold spores
- Great for high velocity equipment because it is engineered for high air flow
- Measures 16 inches by 25 inches by 1 inch
- 401 Replacement Filter Media for Aprilaire 2400
Home Improvement (Lennox Healthy Climate Solutions)
Price:$44.99$22.12- Manufactured by American Air Filters.
- Fits Aprilaire/Space-Gard Model No. 2400.
- Replacement for Aprilaire Part #401.
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A dish-shaped mirror focuses sunlight onto a glass ball, which distributes it evenly onto an array of photovoltaic cells. Credit: Blake Coughenour
The mirrors focus sunlight onto a 5-inch glass ball and from there to a small array of 36 highly efficient photovoltaic (PV) cells, developed originally to power spacecraft. They convert a broader range of the solar spectrum into electricity than regular cells.The ball lens is coated to maximize transparency for the incoming rays. Angel said that an undergraduate student working in the lab, Ivan McCrea, discovered a new way of coating the lens for very high transmission.
Another student, Blake Coughenour, a graduate student in the UA's College of Optical Sciences, is working on the optics to more efficiently couple the dish-collected sunlight to the cells.
"Because we are focusing highly concentrated sunlight onto the cells, we had to design an effective cooling system for the cells," Coughenour said. "Otherwise, they would melt within seconds."