Making a filter yourself, what should one pay attention to?

Hello,

we own a Schwörerhaus and want to buy the filters for the ventilation system as roll goods to cut and sew ourselves. However, I am a bit confused because the necessary filters come with different values. I originally thought G3 is just G3. But now I have seen, for example, that G3 filters etc. have different ISO Coarse values and none of that makes sense to me.

Is it enough to pay attention to the designation G2, G3, and G5, or do you also have to consider other things like the ISO Coarse, etc.? I would be very happy if someone could help me, because I don’t know exactly what to look out for when buying so as not to damage the system. Many thanks in advance.

Our original filters are as follows
- G2 as round exhaust air filter (with ISO Coarse 30%)
- G3 pocket filter for the intake hood (ISO Coarse 45%)
- G5 exhaust air filter in the system (ISO Coarse 50%)

Best regards
Sunny

Is it enough to pay attention to the designation G2, G3, and G5 or do you also have to consider other things like the ISO Coarse, etc.?

So both are the same, just with different designations.

Thank you for the information. I was just surprised that once Iso Coarse 30% and once 45% was indicated on G3 filters. And that there is also material with different face velocities. It all doesn't mean anything to me.

A G4 filter is definitely sufficient for the exhaust air filter. It only protects the motor from getting dusty. Is there anyone in your household with allergies or do you live in an area with polluted air (highway nearby or factory with strong exhaust, heavily blooming fields, etc.)? We have an F7 filter in the supply air because we have a lot of forest, pastures, and meadows around us and my wife has allergies. The filter is cleaned with the vacuum cleaner every three months and replaced once a year.