Does it matter which direction the liquid flows thru this? There is a smooth side and a fuzzy side, which side goes up?

The fuzzy side is up - that is, liquid flows through the fuzzy and out the smooth, harder side.

Is this breathable? i wanna make some filter masks so i wanna make sure it's safe and breathable. tia

No. This is a 1 micron water filter. To be effective it would need to be .01-.05 micron. 1 micron is 1000 nanometers. Viruses are the smallest airborne microbes, ranging in size from .01 to 0.3 microns (10 to 300 nanometers).

I am not sure if you sent the wrong size I ordered the 100 µm water will not flow through it the singed back is stopping the flow?

A) How much water are you trying to push through it? If you have several gallons, or you have built a pressure vessel, then the weight/pressure will push the water through the filter, with particles caught and unable to pass. On the other hand, if you only have a pint or so of water, spread out over a square foot of filter, then surface tension will be stronger than gravity and the water won't go through. B) You will also want to use the singed side down - the water should enter the non-singed side and exit the singed side.

what is the best micron size for a A/C pre filter? 5 micron stops the air flow. Is 100 Micron to big to stop dust particles?

I would recommend the 50-100 micron as a prefilter

Duda Diesel | Desertcart Lithuania

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Description

🔥 Filter Like a Pro, Perform Like a Boss 💼

HEAT RESISTANT UP TO 275 F - Handles high-temperature applications without compromising durability.
ROBUST CARBON STEEL SUPPORT RING - Maintains shape and stability under demanding conditions.
VERSATILE CHEMICAL COMPATIBILITY - Perfect for water, oil, biodiesel, fuels, acids, alkalis, and organic solvents.
PRECISION FILTRATION AT 50 MICRONS - Capture even the finest particles for cleaner fluids and superior performance.
DURABLE SINGED POLYESTER CONSTRUCTION - Enhanced fabric strength ensures long-lasting, reliable filtration.

The Duda Diesel Energy Sheet is a 50-micron, singed polyester felt filter media designed for high durability and precision. Measuring 1 yard by 72 inches, it features a carbon steel support ring and hanging strap, making it ideal for filtering water, oil, biodiesel, fuels, and various chemicals at temperatures up to 275°F.

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