Hydrophobic Acoustic Mesh - Allows air to pass, but stops water

I want to use this to put over a window fan to block light but allow air to pass through, will this reduce airflow too much and does it block light?

The amount of both air and sunlight that passes through the mesh depends on the pore size of the specific variant of the material. You will have to test different variants in order to evaluate if it works for the intended application.

I am looking for a fabric in order to protect a microphone array from the rain. The fabric should be sound transparent and waterproof. Do you have a fabric that can satisfy these requirements?

The hydrophobic acoustic mesh is made for exactly this type of application. But be aware that water will pass if the textile is subjected to direct heavy rain or water under pressure.

I want to drill ventilation holes in an old Macbook and use this material to cover the holes. Is it possible to attach it to the inside of the holes with tape?

We only sell the material sample you see on the webshop. You can cut the shapes you need with a laser cutter and attach the adhesive yourself. You need to find a company who does "tape conversation" and assembly to have larger quantities made. 

Can you provide me with a data sheet for the material ?

The sample we offer is used by product developers, inventors, and designers to get a feel for the material and to do small experiments. The information card which is attached to the sample includes contact information for the material supplier, who can provide data sheets for the many different variants that are available.

Does this product also provide protection from humidity passing through the fabric?

No. It is the surface tension of the water that stops water from passing through the hydrophobic textile. Water molecules within the air (aka humidity) will pass through with the air.

Which of these products would allow the maximum air flow? The intended use is for a vent on an aircraft which will allow air to enter the cabin but keep rain out.

The air flow is inversely proportional to the ability to keep water out. Therefore, if you desire high air flow, you need a mesh with a large open area, which will, in turn, increase the risk of water penetration.

There is a broad range of variants of the material, with differences in the diameter of the individual threads and the thread count. The sample includes an attached information card that provides contact information for the material manufacturer. They can assist in selecting the most suitable variant for your application.

Can this fabric be easily cut with a knife or scissors? How can it be fixed to metal?

It is a soft textile, so it is very easy to cut with a sharp pair of scissors. It can be fixed to other substrates mechanically, with adhesive tape, or by gluing it.