Depending on how humid it is, fogging can be an issue for even the best mask. Especially if you also wear glasses and sweat a lot... I've never used a mask fan myself, but I have thought about buying one.

One trick I learned a long time ago is to rub antiperspirant on your forehead and around your eyes. Be sure to use antiperspirant and not deodorant. Unscented gel antiperspirant works best in my experience (the scented stuff tends to irritate the eyes). For me I've found that this eliminates fogging issues unless it's very humid.

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A5, 12" PPS Brass (.690) with Apex tip, Tacamo HK 416 shroud, Tacamo AK-47 Sight Cover, JCS Gold Powertube, E-Grip (APE), Core CQB Wire Stock w/ RVA, Palmer Inline Stabilizer, Lapco Cyclone Ratchet, 450 round Hopper, 48 oz CO2 with remote line