Image Credits: Ostberg Americas, Inc. | Terra Universal, Inc. | Central Blower Co.   HVAC fans and blowers are used to move air through heating, ventilating, and air conditioning (HVAC) systems. They are an integral part of the air handling systems that bring or draw fresh air into buildings. HVAC fans and blowers can be mounted to an exterior wall (ventilation unit) or above the ceiling (plenum fan), or used as part of a ducted system...
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Q & A on HVAC Fans and Blowers

We asked our users for their input on HVAC Fans and Blowers. Here are the results of 95 users familiar with HVAC Fans and Blowers.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing HVAC fan and blower design?
13 answers
Answers:
VFD, but people often forget that 1. VFD only pays for operating at a lower speed not at full speed At full speed why would you need a VFD! 2. Blowing into a system you have to make a static pressure before air starts to blow.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Very good insulation of the structure can make extensive duct work less important.
~Marv B, Retired homeowner, Montrose, CO
Low noise high air flow volume. Computer design and simulation of fan design.
~Sompong Vongpanyaporn, Managing director, Bangkok, Thailand
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Q:
From your perspective, which companies are creating the most innovative HVAC fans and blowers?
10 answers
Answers:
They all pretty much have the same product. It's the guy specing it coming up with a better fan for his application that matters most for improvement.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Nordic Heater in Sweden
~Bert T, Engineer, Stockholm, Sweden
Denso, Behr, Mitsubishi
~Chin Y, Engineering Consultant, Shanghai, PRC
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Applications and UseTop

Q:
What are some of the applications you have used HVAC fans and blowers for?
27 answers
Answers:
I put a small fan in a flexible insulated pipe inside my attic to move warm air from near the location of my wood stove to the master bedroom. It works! Previously we had cold drafts in the family room when the wood stove was operating, and the air was much colder in the bedrooms than in the family room, which was often too hot. Now it is much more moderated. I would like to find some high velocity fans in small diameter pipes for other rooms. It seems this could eliminate the need for expensive retrofitting of a furnace with extensive duct work.
~Marv B, Retired homeowner, Montrose, CO
1. Air handling units. 2. Fan coil units. 3. Fresh air handling units. 4. Extract fans. 5. CCU.(for IT server room) 6. Cooing tower. 7. Package units.
~Maintenance/Facilities Management, Dubai, United Arab Emirates
Mainly ventilation, Auxiliary mine ventilation, scrubber systems, cooling fans for alternators, traction motors, inverters, and truck radiators.
~Engineering, Design, Pretoria, South Africa
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Q:
Please share with us any “non-standard” applications that HVAC fans and blowers have been used for.
7 answers
Answers:
High pressure requirements using axial fans rather than centrifugal fans.
~Engineering, Design, Pretoria, South Africa
Single room heat recovery unit built inside the window frame.
~Hans S, Design Engineer, Wald, Switzeland
To blow up a canvass cover on a 50 meter swimming pool.
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of HVAC fans and blowers?
7 answers
Answers:
A fan blew down a partition wall because there was no R/A-relief air path. A fan sucked in air handling unit walls that the R/A and O/A dampers had closed on.
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia
Bad design of BLDC electronics leading to premature ball bearing failure with very high recall rate.
~Hans S, Design Engineer, Wald, Switzeland
Extreme noise and vibration levels bring rapid deterioration and lower value to the property.
~JOJO C, President & General Manager, Las Pinas City, Philippines
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
12 answers
Answers:
Efficient, vs operating at the lowest speed. High efficiency may be lost in a short time. Seals, or clearances wear so in practical terms the extra efficiency isn't here for the long run with out a continuous up keeping. Which may not be available. Thing that run slow - tear themselves apart slow. A 3600rpm fan will squeal then shortly shutdown. A low speed fan will run for days.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Square type centrifugal fans, backward curved impellers, motors installed on top.
~BERNARDO TREWIK, General Management, SANTIAGO, CHILE
Increased efficiencies, quieter, longer life, lower vibration levels
~Engineering, Design, Pretoria, South Africa
1. Light weight 2. Variable speed 3. Adjustable static pressure
~Mathiyalagan K, Engineering Consultant, Anand, India
Compact and maintenance free unrustable sound less construction.
~Inder V, Technical Support, Silvassa, India
Best efficiency in the world and the lowest noise ever.
~Bert T, Engineer, Stockholm, Sweden
Ease of installation (retrofit). Quiet operation.
~Marv B, Retired homeowner, Montrose, CO
Greater efficiency and power consumption
~Chin Y, Engineering Consultant, Shanghai, PRC
Compact size Low noise High air flow
~Sompong Vongpanyaporn, Managing director, Bangkok, Thailand
Better noise criteria level
~JOJO C, President & General Manager, Las Pinas City, Philippines
More efficient, lower noise
~Hans S, Design Engineer, Wald, Switzeland
Fan manufacturers data
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using HVAC fans and blowers?
10 answers
Answers:
Carefully compare forward / backward curved option Check for low power consumption at low speeds Make sure bldc fans have no commutation noise
~Hans S, Design Engineer, Wald, Switzeland
The quieter type. Soft start var operation as needed during the day.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Make sure that you nominate the fan external pressure when purchasing.
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia
Be clear about your exact needs of the process.
~Inder V, Technical Support, Silvassa, India
Be sure that the performance curves are real.
~BERNARDO TREWIK, General Management, SANTIAGO, CHILE
Listen to your engineering consultant.
~JOJO C, President & General Manager, Las Pinas City, Philippines
Ask the right questions.
~Bert T, Engineer, Stockholm, Sweden
Air conditioner maker
~Sompong Vongpanyaporn, Managing director, Bangkok, Thailand
Nothing special
~Mathiyalagan K, Engineering Consultant, Anand, India
Buy a system
~Chin Y, Engineering Consultant, Shanghai, PRC

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of HVAC fans and blowers?
9 answers
Answers:
Make sure that you use total pressure to select the fan; look for system effect problems. Consider the noise criteria. Take into account the heat gain due to the heat of compression when calculating the heat load.
~Alan B, Commissioning & Balancing Technician, Melbourne, Australia
When fans and blowers are required to be installed as a battery, individual blower / fan must have an inbuilt non return damper.
~Inder V, Technical Support, Silvassa, India
Have good duct work. Size to the duct and present conditions. It may have changed since installation.
~Paul Ozment, Engineering Consultant, Detreoit, MI
Fans & Blowers should be useful to serve the intended purpose without any maintenance problems.
~Mathiyalagan K, Engineering Consultant, Anand, India
Check for commutation noise for sensitive applications (e.g. bedroom, living room).
~Hans S, Design Engineer, Wald, Switzeland
Always thinking about lower noise and energy consumption.
~Sompong Vongpanyaporn, Managing director, Bangkok, Thailand
Use a correct sized motor to the fan.
~Bert T, Engineer, Stockholm, Sweden
Consult a knowledgeable engineer.
~JOJO C, President & General Manager, Las Pinas City, Philippines
Try not to run pipes too long.
~Chin Y, Engineering Consultant, Shanghai, PRC



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