Bhubaneswar: Have you noticed that it is generally cooler outside your home or on rooftop compared to indoors in the evenings? This is more pronounced if your house has poor ventilation.
You can drive the heat out of your home and force cool air to enter by using vent and exhaust fans strategically. While simple exhaust fans are a good option, proper ducted vent fans are even more effective, if placed properly. One of the most important things is to calculate the proper size of the vent fans required.
How to calculate exhaust fan size?
Vent fans are calculated according to the volume of air exchanged in a particular time usually in cubic feet per minute (CFM). A rough thumb rule is 1 CFM for 1 sqft of space. For a detailed calculation, you need to determine how many times you need to exchange the air completely in an hour or frequency.
According to Japanese engineering firm KDK, Airflow required = Volume of room * Frequency of air exchange / 60
The frequency of air exchange is usually 5-6 times for normal rooms and as high as 15-20 times for kitchens.
For small bathrooms, a standard 100-150mm exhaust is often enough. Some vent fans come with flaps that close due to gravity. These help in keeping insects out.
Exhaust fan in reverse?
You can install an exhaust fan on your wall in a reverse direction to force cool air to enter your room. This is quite effective if the air outside is cooler in evenings and night.
Things to note:
Benefits of forced ventilation:
Also Read: Beat The Heat By Painting Roofs White
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