Inside with plastic and carton to protect the pocket filter; outside is in plywood.

 1. How long can this HEPA filter to be used?

It's depending on the working environment. If the environment is not very dirty,usually it can be used for over 1 year.

2.Does your factory has any certifications?

Yes, we have past the ISO9001 & CE certifications. Meantime, all the HEPA filters must be test one by one before shpiment.

3.Does your factory manufacture the nonstandard size?

Yes, we can according your need to manufacture the sizes.

4.How can I contact the person to discuss the details?

Please send an inquiry for us, we will arrange the professional salesman to follow your need.

5. If I send an inquiry, how long does the person to reply?

If it's the working days, usually we will reply you wihin in 24 hours. If it's on the weekend or on the holiday, usually it will need 2~3 days.

6.For more questions, please contact us directly.