Sample picture as below:

1.We are manufacturer, regular size 2X4, 3X6, 4X6mm for diamond ,

we can make sample as your requirement .

2. Fit for different kinds of air diffuser and grill inside net .

3. Can be prevent dust and worm for diffuser.

Aluminum net have flat and wave type for you choosing , two different nets 

Flat type suit for different kinds air diffuser and grill

Wave type suit for air filter and air diffuser and grill

There also have the nylon materials, manufactured from Plastic as well.