Marc Line is a division of Shield Air Solutions, Inc.

Explosion proof equipment for hazardous locations. Modified for use in a variety of industrial, hazardous locations.

Large capacity, single package, wall mounted, combination AC and Pressurization systems

Wall Mounted

Single Package, wall mounted combination AC and pressurization systems
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Redundant Wall or Pad Mounted

Redundant, wall or pad mounted, combination AC and Pressurization systems
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Window Unit/Split Systems

Window unit air conditioners and heat pumps for use in hazardous locations and industrial applications
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Modification Services

Customer supplied equipment modified for use in industrial and/or hazardous applications
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Two Brands One Company

Shield Air Solutions, Inc. was formed in 2009, uniting The Birdwell Company and Marc Climatic Controls

Founded in 1978, the Marc product line provides both custom and pre-engineered HVAC equipment for a wide array of hazardous and industrial applications. Innovation and flexibility within the Marc product line provide a solution for a variety of projects around the globe. The Marc product line provides a cost effective solution for your specific application.
Units Delivered Worldwide
Years of collective exprestise



Oil & Gas


Refineries & Chemical Plants


Paper & Flour Mills


Aerospace & Custom Applications


There is no greater wealth than wisdom, no greater poverty than ignorance; no greater heritage than culture and no greater support than consultation.

Shield Air is committed to partner with our customers to provide innovative custom solutions. Our team utilizes 100 years of industry knowledge, engineering, manufacturing and problem solving experience to meet the unique need and expectations of every customer.

Shield Air is committed to continual product development in order to provide superior industrial and explosion proof HVAC equipment and fans. Our team strives to not only meet, but to exceed our customers’ expectations. Our customer promise:

Our Customers

Shield Air proudly serves customers around the world. With its two product lines, Birdwell and Marc Climatic Controls, Shield Air offers the most expansive suite of products for severe duty, explosion proof air conditioning and explosion proof fans. Shield Air makes the following promise to every customer

Get In Touch!

We are looking forward to start a project with you!

  • Over-the-phone technical support and trouble shooting guidance
  • On-site field support
  • SAT and FAT observation, coordination, and operation
  • Certified and fully credentialed factory technicians
  • International partnerships for faster service response times


3708 Greenhouse Road,

Houston, TX 77084

Business Hours

Mon – Fri …… 8 am – 5 pm
Sat, Sun …… Closed


1 (281) 944-4300

Toll Free:
1 (800) 237-2095