So now you understand that if you use a carbon filter you will lose pressure and capacity. How much capacity is left depends on the
pressure your fan can build and the pressure drop in your system.
We at Phresh Filters understand that you are not a HVAC specialist so we have calculated which fan would be suitable for which filter. The
average recommended fan capacity is incorporated in the filter model name. So for a Phresh 1500 filter we recommend you use a 1500
cubic meters per hour fan. But keep in mind that fans that builld higher pressure will move more air through your filter than fans with a
lower pressure rating. For this rated capacity the flange already has the right diameter. NEVER use ducting that is smaller in diameter than
the flange of your filter or fan as this will cause pressure drop.
Fans make noise. But most noise is created by the air that moves. A high air speed will create more air noise. We recommend to use air
speeds up to 7 m/s. If you use a wider ducting the air speed will reduce and so will the noise.
Choosing a filter that is a bit bigger than you originally planned with the right size ducting can reduce the noise of your system
The Phresh Filter model numbers represent the recommended fan capacity.
Filter size table
-Please note that the filter models correspond to the recommended fan size. Always use a fan with the correct flange size.