About


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Larry Hopkins P.E. has more than 30 years experience in the HVAC industry, he has held the positions of VP of Engineering at PACE Co., President of Cleanpak International, Vice President of Engineering at Huntair and co-founder and VP of Research and Development at Basx Solutions. In each business Larry led product development efforts in several key areas including fan design, development of the Fanwall or Fan Array Technology, low loss fan backdraft damper, fan balancing and isolation systems and active control of fan noise. Larry has been awarded over 20 patents for products used in the HVAC industry. Larry is a co-founder of OnFlow Systems.

Josh Foos has more than two decades of experience in the custom HVAC industry with Temtrol, Huntair and BASX. In each business Mr. Foos has led product development efforts in several key areas including fan design including fan arrays, back draft damper design, air handler design and structural systems. His primary interests and focus is on R & D and Product development. Current designs include unit casing, access door and hardware, Fan Array, Backdraft Damper, Foam Presses, Injection molded plastics and Cast Stainless Steel parts. Josh is a co-founder of OnFlow Systems.

Earl Barfield has worked in the HVAC industry for over 30 years. Starting at Brod and McClung Pace Co as a designer and Sales application engineer. Mr. Barfield spent several years at Cleanpak International as a Project Manager responsible for large accounts including Hewlett Packard and Intel. Earl also worked at Basx Solutions where he was responsible for developing a computer aided air handler design program and an online fan selection program. Earl is a co-founder of OnFlow Systems.

Patents

OnFlow team
has been awarded more than 20 patents in the areas of fan design, air handling
systems and products.  Some of the more
popular inventions include:

Inlet air flow conditioning for centrifugal fans

US5088886A Lawrence G. Hopkins 

Priority 1990-08-28 •
Filing 1990-08-28 • Grant 1992-02-18 • Publication 1992-02-18

A grate of rigid intersecting
strips is positioned across the inlet cone of a fan for diffusing the vortex of
inlet air to the fan and to induce a uniform velocity gradient at the fan
blades. This conditioning of the inlet air reduces turbulence during operation
of the fan and, therefore, noise …

Fan array fan section in air-handling systems

US20050232753A1 Lawrence Hopkins 

Priority 2003-03-20 •
Filing 2005-06-15 • Publication 2005-10-20

A fan array fan section
in an air-handling system includes a plurality of fan units arranged in a fan
array and positioned within an air-handling compartment. One preferred
embodiment may include an array controller programmed to operate the plurality
of fan units at peak efficiency. The plurality …

Fan array control system

US20110014061A1 Lawrence G. Hopkins

Priority 2003-03-20 •
Filing 2010-09-23 • Publication 2011-01-20

A fan array fan section
in an air-handling system includes a plurality of fan units arranged in a fan
array and positioned within an air-handling compartment One preferred
embodiment may include an array controller programmed to operate the plurality
of fan units at peak efficiency by computing …

Methods and systems for active sound attenuation in an air handling unit

US20110255704A1 Lawrence G. Hopkins

Priority 2010-04-15 •
Filing 2011-03-10 • Publication 2011-10-20

A system and method for controlling
noise produced by an air handling system is provided. The system includes a
source microphone to collect sound measurements from the air handling system
and a processor to define a cancellation signal that at least partially cancels
out the sound measurements.

Back draft damper

 US20130072103A1 Lawrence Hopkins

Priority 2009-07-29 •
Filing 2012-11-08 • Publication 2013-03-21

A damper is provided. The
damper includes a frame having a central opening through which air passes. A
plurality of vanes are rotatably mounted within the frame. At least one of the
vanes is oriented about a rotational axis that is offset at a non-orthogonal
angle with respect to one of a …

Back draft damper

US20110028080A1 Lawrence Hopkins 

Priority 2009-07-29 •
Filing 2009-07-29 • Publication 2011-02-03

A back draft damper
includes a rectangular shell having a central opening which air can pass
through. A plurality of vanes rotatably mounted in the shell are rotatable
between open positions where air can pass through the shell and closed
positions where air cannot pass through the shell. The axes …

Fan array vibration control system and method

US8963466B2 Lawrence G. Hopkins 

Priority 2012-10-08 •
Filing 2012-10-08 • Grant 2015-02-24 • Publication 2015-02-24

A fan array vibration control
system may include a fan array having a plurality of fans, and a control unit
operatively connected to the fans. The control unit is configured to operate
the plurality of fans and detect a phase relationship among the plurality of
fans. The control unit is configured …

Methods and systems for active sound attenuation in a fan unit

US20130022212A1 Lawrence G. Hopkins 

Priority 2010-04-15 • Filing 2012-09-25 • Publication
2013-01-24

A system and method for controlling noise produced by an air handling system, for
example, is provided. The system includes a source microphone to collect sound
measurements from the air handling system and a processor to define a
cancellation signal that at least partially cancels out the sound …