(a) Any person may request a testing exemption under §90.905.

(b) Any nonroad engine manufacturer may request a national security exemption under §90.908.

(c) For nonroad engine manufacturers, nonroad engines manufactured for export purposes are exempt without application, subject to the provisions of §90.909.

(d) For eligible manufacturers, as determined by §90.906, manufacturer-owned nonroad engines are exempt without application, subject to the provisions of §90.906.

(e) For any person, display nonroad engines are exempt without application, subject to the provisions of §90.907.