Voxxie breathe the nitrogens.

modular_splurt/code/modules/atmospherics/auxgm/breathing_classes.dm

@@ -0,0 +1,11 @@
+/datum/breathing_class/nitrogen
+	gases = list(
+		GAS_N2 = 1,
+	)
+	products = list(
+		GAS_CO2 = 1,
+	)
+	low_alert_category = "not_enough_N2"
+	low_alert_datum = /atom/movable/screen/alert/not_enough_nitro
+	high_alert_category = "too_much_N2"
+	high_alert_datum = /atom/movable/screen/alert/too_much_nitro

modular_splurt/code/modules/clothing/outfits/standard.dm

@@ -1,4 +1,5 @@
 /datum/outfit/vox
 	name = "Vox"
-	r_hand = /obj/item/tank/internals/plasmaman/belt/full
+	r_hand = /obj/item/tank/internals/nitrogen
+	l_hand = /obj/item/tank/internals/doublenitrogen
 	mask = /obj/item/clothing/mask/breath

modular_splurt/code/modules/clothing/suits/heavy.dm

@@ -137,6 +137,22 @@
 	air_contents.set_moles(GAS_PLASMA, (3*ONE_ATMOSPHERE)*volume/(R_IDEAL_GAS_EQUATION*T20C))
 	return
 
+/obj/item/tank/internals/doublenitrogen
+	name = "double nitrogen tank"
+	desc = "Two tanks of nitrogen stuck together. Double the nitrogen double the fun"
+	icon_state = "nitrogencbrn"
+	icon = 'modular_splurt/icons/obj/items_and_weapons.dmi'
+	lefthand_file = 'modular_splurt/icons/mob/inhands/items_lefthand.dmi'
+	righthand_file = 'modular_splurt/icons/mob/inhands/items_righthand.dmi'
+	distribute_pressure = TANK_DEFAULT_RELEASE_PRESSURE
+	force = 10
+	dog_fashion = null
+	volume = 140
+
+/obj/item/tank/internals/doublenitrogen/populate_gas()
+	air_contents.set_moles(GAS_N2, (3*ONE_ATMOSPHERE)*volume/(R_IDEAL_GAS_EQUATION*T20C))
+	return
+
 //research nods
 
 /datum/design/cbrn/cbrncivi
@@ -239,12 +255,22 @@
 	category = list("Equipment")
 	departmental_flags = DEPARTMENTAL_FLAG_SECURITY | DEPARTMENTAL_FLAG_ENGINEERING | DEPARTMENTAL_FLAG_SERVICE | DEPARTMENTAL_FLAG_CARGO | DEPARTMENTAL_FLAG_SCIENCE | DEPARTMENTAL_FLAG_MEDICAL
 
+/datum/design/cbrn/nitrotank
+	name = "Double Nitrogen Tank"
+	desc = "A Double Nitrogen tank."
+	id = "cbrn_nitrogen"
+	build_type = PROTOLATHE
+	materials = list(/datum/material/iron = 200)
+	build_path = /obj/item/tank/internals/doublenitrogen
+	category = list("Equipment")
+	departmental_flags = DEPARTMENTAL_FLAG_SECURITY | DEPARTMENTAL_FLAG_ENGINEERING | DEPARTMENTAL_FLAG_SERVICE | DEPARTMENTAL_FLAG_CARGO | DEPARTMENTAL_FLAG_SCIENCE | DEPARTMENTAL_FLAG_MEDICAL
+
 /datum/techweb_node/cbrn
 	id = "cbrn"
 	display_name = "CBRN gear"
 	description = "Chemical, Biological, Radiological and Nuclear protective gear"
 	prereq_ids = list("engineering")
-	design_ids = list("cbrn_civi", "cbrn_sec", "cbrn_engi", "cbrn_serv", "cbrn_cargo", "cbrn_sci", "cbrn_med", "cbrn_mask", "cbrn_boots", "cbrn_gloves", "cbrn_glovesengi", "cbrn_hood", "cbrn_oxy", "cbrn_plasma")
+	design_ids = list("cbrn_civi", "cbrn_sec", "cbrn_engi", "cbrn_serv", "cbrn_cargo", "cbrn_sci", "cbrn_med", "cbrn_mask", "cbrn_boots", "cbrn_gloves", "cbrn_glovesengi", "cbrn_hood", "cbrn_oxy", "cbrn_plasma","cbrn_nitrogen")
 	research_costs = list(TECHWEB_POINT_TYPE_GENERIC = 2000)
 
 /datum/techweb_node/mopp

modular_splurt/code/modules/surgery/organs/lungs.dm

@@ -3,12 +3,12 @@
 	desc = "Helps regulate the body temperature of synthetic beings. Helpful!"
 
 /obj/item/organ/lungs/vox
-	name = "plasma filter"
-	desc = "A spongy rib-shaped mass for filtering plasma from the air."
-	icon_state = "lungs-plasma"
-	breathing_class = BREATH_PLASMA
+	name = "vox lungs"
+	desc = "A set of lungs adapted to filter nitrogen. They're filled with.. dust."
+	icon_state = "lungs-x"
+	breathing_class = BREATH_NITROGEN
 	maxHealth = INFINITY//I don't understand how plamamen work, so I'm not going to try t give them special lungs atm
 
 /obj/item/organ/lungs/vox/populate_gas_info()
 	..()
-	gas_max -= GAS_PLASMA
+	gas_max += GAS_O2