Certificate of RegistrationThis certifies that the Quality Management System of

CTA Acoustics - Corbin100 CTA Boulevard

Corbin, Kentucky, 40701, United States

has been assessed by NSF-ISR and found to be in conformance to the following standard(s):

ISO 9001:2015Scope of Registration:

Design and Manufacturing of Thermal and Acoustical Products.

Carl Blazik,Director, Technical Operations & Business Units,NSF-ISR, Ltd.

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Certificate Number: C0109062-IS1Certificate Issue Date: 30-JAN-2018Registration Date: 30-JAN-2018Expiration Date *: 29-JAN-2021

This Annex is only Valid in connection with the above-mentioned certificate issued by NSF-ISR

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ANNEX PAGE FOR CERTIFICATE REGISTRATION NUMBER C0109062-IS1

CERTIFICATE ISSUE DATE: 30-JAN-2018CERTIFICATE EXPIRATION DATE: 29-JAN-2021

CTA Acoustics - Corbin100 CTA Boulevard

Corbin, Kentucky, 40701, United States

Remote Location: CTA Acoustics- C0123125

25211 Dequindre RoadMadison Heights, Michigan, 48071, United States

Scope:Sales, Marketing and Engineering

Remote Location: CTA Acoustics, Inc- C0141409

9670 Maple StreetOrland, Indiana, 46776, United States

Scope:Warehousing

Remote Location: CTA Acoustics- C0177025

124 Douglas AvenueCorbin, Kentucky, 40701, United States

Scope:Warehousing