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Tightening mask question -- How tight?
I think the "looser is better" applies mainly to the nose masks, such as my F&P Eson mask.. 

Full face masks and nasal pillows are more likely to need to be "tighter" to seal properly.

But as others have said, whatever works best for you as an individual is the way to go.
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In my short amount of experience (9 nights now!) with my FFM (ResMed Quattro Air), I have found that it takes a very snug fit to prevent leaks, especially around my nose and into my eyes. I worked at balancing the upper straps with the lower straps to find a happy medium and I think after a week of making those adjustments I've found the sweet spot.

I don't wake up with any red marks or imprinting on my face and the leaking has slowed to almost non-existent, especially when I move around at night. I tend to sleep on my side so making sure the mask and pillow don't collide (which caused a lot of leaking the first few nights) was also key.
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I have a ResMed Quatro FX FFM and have found over the years it works better tight against my face. I have a tendency to sleep on my side (as if I am not wearing a mask) and if it isn't tight, I get massive leaks along the sides as the mask shifts. I also flew airplanes in my prior life and the oxygen mask had to fit tight.

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The patented Spring Air™ cushion features dual walls for a comfortable, gentle fit that's also snug for optimum sleep apnea therapy.

This statement tells me that properly fitted this mask should NOT be "Tight".

Q. What's the correct way to fit a mask?

A. Fitting a mask properly depends a great deal on your position. Facial muscles change when we lie down and relax even further once we’re asleep, so it’s always best to fit the mask while you’re in your sleeping position. Whether you sleep in a bed with no pillows or in a recliner, you should fit your mask in your usual sleeping position. If you experience difficulties in fitting your mask, please refer to your mask user guide for complete fitting instructions or discuss it with your care provider or equipment supplier.

Q. Do I have the right mask size? I have to strap it so tight to obtain a seal that it hurts.

A. It’s important not to over-tighten your mask. Doing so may be a sign that you have the wrong cushion size or an incorrectly adjusted forehead support. If you’re using a ResMed mask that has a MicroFit dial, it’s important to note that your clinician has set the dial at the optimal position and adjusting it significantly from that position may cause discomfort. If you experience difficulties in fitting you mask, please refer to your mask user guide  for complete fitting instructions or discuss this with your medical equipment provider or physician.

Q. My mask is leaking. What does this mean?

A .Refer to the troubleshooting section in your mask user guide. Mask leak may indicate one of several things, including:

  • incorrect adjustment

  • incorrect assembly

  • incorrect size

  • your mask is worn out and needs replacement
Contact your doctor or equipment supplier to determine which of the above factors is interfering with the proper fitting of your mask.

Look at this site, there is a how to fit video called "Quattro Air How to fit" that runs 1:47

Are you fitting top first, bottom, top again?  That is the recommended method.
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Judging by the fact I have light impressions on my face from the straps, I may have it slightly too tight, but I think I'm OK. Sounds like a lot of people here have it fairly tight.
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