About Us

Flow-Box is manufactured and distributed by Sierra Building Science, Inc.

Sierra Building Science, Inc. is a training and consulting firm  that specializes in topics related to residential HVAC and energy.

Russell King, M.E. is the Founder.  He is a licensed mechanical engineer with over 25 year of experience in the areas of HVAC design, energy codes, home energy rating systems and building science.  He has taught numerous professional level classes on all of these topics.

Sierra Building Science, Inc. also manufactures and distributes Duc-Bloc™ register-sealing devices used for duct leakage testing.

Sierra Building Science was recently acquired by CalCERTS , Inc. the premier Home Energy Rating System (HERS) Provider in California.


Watch this video to learn how large powered flow hoods work.