This is all you need to have a fast, efficient and effective [Zephyr]. Don't waste mods trying to build a damage dealing Warframe around her. She has another great means of dealing mass damage quickly but I'll get to that. Instead focus on her amazing ability to stay alive and mobile in nearly all situations. First max out her efficiency, turbulence will be her best means of defence as it completely negates all incoming fire and with a [Stretch] mod equipped that goes for all aoe attacks too. The only thing that will be hitting you is melee. But thats where [Redirection] and [Vitality] come in. Those two mods will also give you plenty of cushion should you be caught in the open without turbulence active. Second work on duration. Along with max efficiency you will almost be sure to have enough energy to recast turbulence as well as anything else for that matter. And thats really all there is to it for mods. For mass damage just aim your tornadoes into a group of mobs and fire into the cyclones. Even one shot from say something like [Vectis Prime] will hit every mob that gets swept up. She has extra defence in that her airbust ability can be cast for very cheap even while she's reloading knocking back all mobs until you're ready to open fire and is great for keeping melee attackers at bay.