Rapid Engineering
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Improving Indoor Air Quality in the Industrial Workplace with Make-Up Air & Building Pressurization. Rapid Engineering LLC manufactures industrial-grade make-up air solutions for the rigors of industrial & commercial applications. Our history and expertise in enhanced heavy-duty welded cabinet construction and features shows through all of our models.

RAPID has earned a reputation for tough make-up air units built to last. Our Batch Ovens are used in a variety of applications across a wide range of industries including: primary metals, fabricated metal production, industrial and commercial machinery, transportation equipment, furniture and fixtures, wood products, rubber and plastic production, as well as stone, clay and concrete products.
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Make up air units are designed for use in commercial & industrial building spaces to provide building HVAC and efficiently establish and maintain a slightly positive air pressure condition in the building by delivering heated or cooled outdoor air. Slight pressurization is desired for increased comfort through reduction of unwanted air infiltration from building seams and cracks or from windows and doors.
RAPID 8500D-Series are indirect-fired air handlers that can be designed to heat, pressurize or cool. The units are available in three different configurations: The Make-Up Air configuration (MUA) supplies 100% outside air for direct replacement of building mechanical exhaust. The Fixed Recirculation configuration (FR) provides a manually-controlled mix of return air and outside air.
How do you maximize the summer cooling capability of your 4000 Direct Fired or 8500D indirect fired Industrial Air Handler? Equip the air handler with a coil section and pair it with a 3200 Series Condensing Unit. A condensing unit is one part of a split system used to cool an occupied space and is installed outside of your building, usually on the roof or on a concrete slab, and paired with an indoor air handler.
We utilize industrial-grade welded construction batch oven cabinetry and heaters for the industrial paint finishing & curing market. Available in 55 standard sizes and designed for 450°F operating temperature, our batch ovens offer the same industrial design quality as RAPID make-up air heaters.
Rapid Engineering offers comprehensive, online technical support for direct- and indirect-fired make-up air handlers, as well as Rapid batch ovens. Find everything you need here to service or maintain Rapid equipment. Get help troubleshooting equipment or ordering replacement parts for your air handler or batch oven.
Reviews (2)
Daren Konecny Jr
Daren Konecny Jr
Jan 04, 2019
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Its hard to reach anyone when you need them, they take forever to call back. not the kind of service you would want when a heating issue arises and you need service help...
Joe Smith
Joe Smith
Aug 01, 2018
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So, not only do they have extremely long lead times (16 weeks!), but they don't even hit that. They continue to delay, push back, and make excuses for why product isn't being shipped. Machines down, materials not on hand, labor issues..... they MAY make a quality product, but after waiting 6 months, I just want to cancel. They took something we were excited about and have made it a nightmare. The worse part is they don't even seem to care. The customer service at this company is non-exsistant and unbelievable. How are they still in business?