Compartment and battery ventilation systems
a	Zuluft . . . . zB Hecktorp R		b6	Bordabsp Notlufthahn Turm		h3	Notausblaseanschluß Bb bzw Stb
	Air supply . . . . for example, to aft torpedo room			Hull valve emergency air exhaust from conning tower			Emergency blowing connection port and starboard
a1	Zuluft . . . . zB Stb Bat 2 Mannsch R o		c	Zuluftußv		i	Zuluftstrang . . . . zB h E Masch R
	Air supply . . . . for example battery 2 starboard, upper crew room			Ventilation supply, hull valve			Bulkhead stop valves, ventilation supply line . . . for example, aft E motor room
a2	Warmzuluft Turmsehrohr h		c1	Abluftußv		i1	Abluftstrang . . . . zB Dieselmot R
	Warm air supply to aft conning tower periscope			Ventilation exhaust, hull valve			Bulkhead stop valves, ventilation exhaust line . . . for example, diesel engine room
a3	Notzuluft Turm		d	Zuluftkopfv		i2	Bat Abluftstrang
	Emergency air supply to conning tower			Ventilation supply, outboard valve			Battery bulkhead stop valve, ventilation exhaust line
a4	Bordv Notzuluft Zentrale u Turm		d1	Abluftkopfv		k	Raumzuluftwähler
	Hull valve emergency air supply to control room and conning tower			Ventilation exhaust, outboard valve			Compartment ventilating air supply selector
a5	Bordabsp Notzulufthahn Hecktorp bzw Bugminenr		d2	Turmluftkopfv		k1	Notabluftwähler
	Hull valve emergency air exhaust aft torpedo room and bow mine room			Air connection to bridge			Emergency ventilation air exhaust control
b	Abluft . . . . zB Küche		e	Regelschieber Lufterneuerungsgerät . . . . zB Zentrale		l	Schalter Raumzulüfter bzw Raumablüfter
	Exhaust air . . . for example, galley			Regulating valve air purification system . . . . for example control room			Control compartment air supply and exhaust
b1	Abluft Bat 1 bzw 2		f	Eintr . . . . zB Bat Ablüfter		l1	Raumabluftschalter
	Exhaust air battery 1 and 2			Inflow . . . . for example battery exhaust blower			Compartment air exhaust selector
b2	nat Abluft . . . . zB Bat 1		g	Bordv Austr Bat Ablüfter		l2	Notzuluftschalter
	Natural air exhaust . . . for example, battery compartment 1			Hull valve battery exhaust blower output			Emergency air supply selector
b3	notabluft Turm		h	Zuluftanschl Turm		l3	Sauerstoffschalter . . . . zB Zentrale
	Emergency air exhaust conning tower			Air supply connection conning tower			Oxygen selector . . . . for example, control room
b4	Borv Notabluft Zentrale u Turm		h1	Notzuluftanschl Zentral u Turm		m	Verb . . . . zB Bat Abluftitg Raumabluftitg
	Hull valve emergency air exhaust from control room and conning tower			Emergency air supply connection control room and conning tower			Cross-connection valve, compartment ventilation systems; i.e., connects port and starboard systems . . . . for example
b5	Bordabsp Notablufthahn Hecktorp bzw Bugminenr		h2	Notabluftanschl Zentral u Turm		n	Absaugen Etos
	Hull valve emergency air exhaust from forward mine room and aft torpedo room			Emergency air exhaust connection control room and conning tower			Ventilating blower fan for Eto torpedoes
						o	Entw . . . . zB Zuluftkopfv
							Drain . . . . for example air supply outboard valve