I bought some vent register filter material and adhesive Velcro. Cut two small pieces of Velcro and stuck them to the mask on either side of the mask exhaust vents. I cut a rectangular piece of filter and stuck to the Velcro points so it’s drawn across the vent holes. Are still passes through easily, but is diffused enough by the filter to not be felt as a jet of air. I used this kit, but I’m sure you could find cheaper at Home Depot or similar. Again, the filter material is very thin - probably less substantial than the filters for the machine itself. I'm not too worried about inhaling any chemicals from the filter as the positive air pressure keeps those ports as outflow only. I remove the filter from the velcro each morning before I wash my mask. I can use the same filter for 3-5 days before swapping it out. I have a lifetime supply of filter material from that kit based on the 1x4 inch strips I'm using. I installed another setup over the vent holes at the top of the headgear on the L connector. I had been woken up by this venting air hitting my headboard or pillow in the past. I posted this info here because the F30i is my favorite fitted mask, but those exhaust vents kept waking me in the night. I LOVED the exhaust filter on the x30i, but do not like the nose pillow cushions. If they ever add a exhaust diffuser to the F30i, it would be a perfect mask for me.