Hayashi Ventilating Fan
OMR:6.750 – OMR:16.200
Hayashi Ventilating Fan Features
Effectively drives out foul air and induces fresh ventilation
- Refreshes your surroundings
- Durable casing and light weight
- High quality motor – reliable, quite and trouble free
- Available in various sizes, types & specifications to suit different air extraction requirements
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Hayashi Ventilating Fan Features – Air Change Calculation CFM
Engineering room airflow may present a real challenge when balancing an HVAC system. Most calculations only use the heat loss or gain of a room to decide on required airflow and often don’t take into consideration required room ventilation needs. Let’s take a look at how an air change calculation may simplify this step in your air balancing.
What is an Air Change?
An air change is how many times the air enters and exits a room from the HVAC system in one hour. Or, how many times a room would fill up with the air from the supply registers in sixty minutes. You can then compare the number of room air changes to the Required Air Changes Table below. If it’s in the range, you can proceed to design or balance the airflow and have an additional assurance that you’re doing the right thing. If it’s way out of range, you’d better take another look.
The Air Changes Formula
To calculate room air change, measure the supply airflow into a room, multiply the CFM times 60 minutes per hour. Then divide by the volume of the room in cubic feet:
Air Changes / hr = ( CFM X 60 min) / ( Volume of Room )
In plain English, we’re changing CFM into Cubic Feet per Hour (CFH). Then we calculate the volume of the room by multiplying the room height times the width times the length. Then we simply divide the CFH by the volume of the room. Here’s an example of how a formula works:
Air Changes / hr = (300 cfm x 60min ) / ( 15’x20’x8’)
Air Changes / hr = 18000 / 2400
Air Changes / hr = 7.50
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