Large Attic Combinations	Note: These combinations require 60 in. of vertical clearance where fan is to be installed.
Products	HERS CFM	Watts	watt/CFM	* HERS Venting	2 CFM/sqft.	3 CFM/sqft
STL Pro 7.0X	4962	773	0.16	6.93	2481	1654
STL Pro 7.0X + 2.5X	6096	969	0.16	6.93 + 2.56	3048	2032
STL Pro 7.0X + 3.3X	6663	1083	0.16	6.93 + 3.13	3332	2221
STL Pro 7.0X + 4.8X	7699	1263	0.16	6.93 + 4.17	3850	2566
STL Pro 7.0X + 5.5X	8168	1302	0.16	6.93 + 5.00	4084	2723
STL Pro 7.0X + 6.0X	8878	1370	0.15	6.93 + 5.37	4439	2959
STL Pro 7.0X + 7.0X	9924	1546	0.16	6.93 + 6.93	4962	3308