Is it bad to oversize a bathroom exhaust fan?

If you are seeking to use ventilation fans in Sri Lanka firstly you need to be aware of the local regulations and guidelines from the municipality council and building regulatory board. The main purpose of using an exhaust fan is to ensure that there is a proper air flow and air circulation in a building or to a specific area in a building such as a bathroom or a kitchen. Therefore, it is important to pick the right fan to fit the right space rather than using an undersized or oversized fan in the very first place.

There are only a very few expectations from an exhaust fan and they are simply to remove hot, moist air and to remove odor. The main constraint with hot, moist air is that it leads to mold growth, and odors lead to general unpleasantness.

Usage of a poor quality, undersized fan is not worth the effort, even if the fan meets the minimum requirements. Therefore it is crucial to understand the sizing structure of vent fans and how to find the right fan with proper capacity for your space.

For example bathroom vent fans are sized, structured and rated for the amount of air they can move and are measured in cubic feet per minute (CFM). The standard fan sizing is applicable to bathrooms that are 100 square feet or less. However, the norm is that you need at least 1 CFM per square foot of room area.

This is definitely confusing for any ordinary household owner and this is why we at Air flow are happy to assist you to pick the right ventilation fan for your bathroom. It is not a crime to slightly oversize your bathroom exhaust fan based on the need. However, it is a must to align with the duct size you use against the exhaust fan you plan to install.

We will help you throughout this process of finding the right exhaust fans in Sri Lanka until installation is completed. One final tip is to be mindful because if you have a small bathroom and you tend to overdo your sizing you might end up with a noisy exhaust fan that is inappropriate to your space.