• Refractory fireproof K90 casing for recessed installation and main rear discharge. • Stainless steel spigot, integrating the K90 fireproof valve, TUM certified according to DIN 18017-3. • Backdraught shutter compliant with DIN 18017-3, as certified by TUV German Institute. • Spigot nominal diameter: 80 mm. • Square frame to prevent entry of dirt and plaster. • Stainless steel spigot, on the left side, able to extract air from a second room.