Customers frequently inquire whether replacement fans can increase airflow without increasing fan size when replacing general Industrial Ventilation Systems by Clean Air Environmental ventilation fans. We will need to look at the customer’s existing fans and the options for increasing airflow before providing an answer. I’ll go over the options for increasing airflow with a fan of the same size and the factors that might limit those options in this article.
Options for Increasing Airflow
When comparing replacement Eldridge E-Fans of the same size to the existing fans a customer has, we look at a number of different options to determine which one or combination of options will provide the most airflow:
Cutting edge Style – A few fans are made with squeezed sharp edges that don’t move air productively. With the same horsepower, replacing these fans with an Eldridge E-Fan with a blade that looks like an airfoil will move more air.
Cutting edge Pitch Point – Eldridge E-Fans have customizable pitch cutting edges that can be set from 10˚ to 35˚. Expanding the pitch point will give more wind stream. However, doing so might necessitate more power.
Propeller Speed – The quicker that a fan propeller turns, the more wind stream it will give. The propeller speed on an immediate drive fan is expanded by utilizing an engine that has a higher speed. By reducing the sheave on the propeller drive shaft in comparison to the sheave on the motor drive shaft, a belt drive fan’s propeller speed can also be increased. It may require more horsepower to increase the propeller speed.
Decrease Strain Drops – Eliminating parts of the structure ventilation framework that are causing pressure drops is one more choice for expanding wind stream. Backdraft dampers, louvers, and hoods can be replaced to reduce system pressure drop and increase airflow, but we won’t recommend removing fan guards or filter boxes.
Limitations
You can’t get more airflow from a fan of the same size. However, the limitations of noise and motor size take precedence over the usual ones, such as cost and efficiency.
Noise: A fan’s noise level will rise as the blade pitch angle and propeller speed are increased. In order to comply with OSHA safety regulations, the noise level in close proximity to workers must remain below 85 dBA. Nonetheless, even at that level, the clamor might be awkward to certain individuals working close to the fan. It would invalidate the point of adding more wind current on the off chance that the specialists are switching the fan off because of more commotion. Before making any changes, it is necessary to carefully consider the amount of additional noise that is acceptable in the particular work environment of a customer.
Engine Size – Expanding cutting edge pitch point and propeller speed will require more drive. As the strength increments, so does the edge size of the engine. There is a maximum motor frame size that Eldridge E-Fans can accommodate for each size. As a result, the maximum motor frame size is the real constraint on the maximum rated airflow for each Eldridge E-Fan size.
Extra Strain Drop – Taking into account that any ventilation framework is a harmony among supply and exhaust wind currents, any expansion in wind current on one side of the ventilation framework will affect the other. Unless the louver size is increased, if louvers are on the opposite side, the increased airflow will result in a higher air velocity passing through the louver. If the louvers meet the same “no increase in size” requirement, the higher air velocity will result in a higher pressure drop that must be taken into account when determining the new fan’s air flow.
Capacity of the electrical supply: A brand-new fan with more horsepower will require more power. The current wire may not be the right measure to deal with the higher amps expected by the new fan. The breaker and/or panel capacity may also need to be increased depending on how many fans are replaced.