EXTN Exterran Corporation

EXPLANATORY NOTE

DEREGISTRATION OF UNSOLD SECURITIES

These Post-Effective Amendments (the “Post-Effective Amendments”) filed by Enerflex US Holdings Inc., a Delaware corporation formerly known as Exterran Corporation (the “Registrant”), to deregister all shares (the “Shares”) of the Registrant’s common stock, par value $0.01 per share (the “Common Stock”), remaining unissued under the following Registration Statements on Form S-8 (each, a “Registration Statement”, and collectively, the “Registration Statements”) filed by the Registrant with the U.S. Securities and Exchange Commission (the “Commission”).

The Registrant is filing these Post-Effective Amendments to withdraw and remove any unissued and unsold securities issuable by Registrant pursuant to the above-referenced Registration Statements.

On January 24, 2022, the Registrant entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Enerflex Ltd., a corporation formed under the laws of Canada (“Enerflex” or “Parent”) and the prior Enerflex US Holdings Inc., a Delaware corporation and wholly owned subsidiary of Enerflex (“Merger Sub”). Pursuant to the Merger Agreement, on October 13, 2022, Merger Sub was merged with and into the Registrant with the Registrant being the surviving entity and becoming a direct, wholly owned subsidiary of Enerflex (the “Merger”), and the Registrant taking Merger Sub’s name. In the Merger, each share of the Common Stock, issued and outstanding immediately prior to the effective time of the Merger, other than certain excluded shares as described in the Merger Agreement, was automatically cancelled and converted into the right to receive 1.021 validly issued, fully paid and non-assessable common shares in the capital of Enerflex (such consideration, the “Merger Consideration”), plus the right, if any, to receive cash in lieu of fractional shares of the Merger Consideration into which such the shares of Common Stock would have been converted.

In connection with the effectiveness of the Merger, the offerings pursuant to the Registration Statements have been terminated. In accordance with undertakings made by the Registrant in the Registration Statements to remove from registration, by means of a post-effective amendment, any of the securities that remain unsold at the termination of the offerings, the Registrant hereby removes from registration all Shares registered under the Registration Statements but not sold under the Registration Statements.