Grade under LAF

What will be grade of area under LAF if it is installed in grade D area?

Area under LAF may be of Class 1000 or 10,000 since the LAF has been installed in grade D (Class 100,000) area. It may not be Class 100. There are several other factors which also determine air class under LAF appart from background area class.
Based on the Peeformance Qualification checks of LAF carried out, exact grade of air under LAF can be ascertained.