Older Fans May Not Be Suitable for a Modern Tunnel House

Dear Dr. Mike Czarick & Dr. Brian D. Fairchild, Thanks for your informative article on air speed. Replacement of old fans with new is an efficient but expensive way of increasing air speed of broiler poultry house. Pl. give your expert opinion on use of tunnel doors in high humidity areas to reduce wet litter and increase air speed with properly maintained old fans. Best regards Dr. M. Akram, Consultant Microbiologist, Micro Laboratories, Karachi, Pakistan

Thanks for sharing wonderful article! How to increase better productivity? We are facing LOT of difficulty to produce better result in deep litter. How to maintain ventilation management in less humidity area? Pl suggest

Dear Dr Czarick Dr Fairchild A new breed of fans have arrived here now manufactured and supplied by Danish and other companies based on Brushless DC (BLDC) motor and inverter ( three phase controlled ). They are much more energy efficient compared to any three phase AC fan presently available in the market. Added advantage is they are direct drive so no change of RPM over time due to worn out belt.Speed can be varied at will due to inverter. There is no change of RPM due to voltage drop, specially here, in hot summer months, again due to use of inverter. They have a long service life due to all plastic cone and propellers made of modern UV treated polymer HDPE( high Density Polyethelene ). I do not know whether they have entered US market. May be you have come accross them and their testing may be in the pipeline.Will you pls comment. Perhaps these companies were were present on ATLANTA Poultry expo. N.B.They claim they have already sumitted the fans for BESS labs testing report Waqar

We installed largest deep litter shed in India (source of supply from GSA). First batch itself we are getting poor performance in production and hatchbility. Please suggest how to improve our production. Thanks in advance

I hope that i have found in best of your health............ i just wanted to ask 1 question that is there any strong relation between the no. of blades a fan has and the efficiency of that fan??????

There really no direct relationship between the number of fan blades and efficiency, air moving capacity, air flow ratio, etc. The only accurate way you can determine fan performance factors is through a fan performance test laboratory. Mike Czarick