Light Residential: Suitable for wall applications or areas with light foot traffic such as powder rooms or guest rooms. 
•    Comparable to PEI 1 & 2
All Residential / Light Commercial: Suitable for use in regularly trafficked residential areas such as kitchens, hallways, bedrooms, and laundry rooms. Light commercial areas with limited traffic, such as offices and retail shops, are acceptable.
•    Comparable to PEI 3
All Residential / All Commercial: Suitable for use in heavily trafficked residential and commercial areas, such as foyers, living rooms, lobbies, hospitals, and airports. 
•    Comparable to PEI 4 & 5