Internal vent size H 18.5mm L 455mm D15mm. External vent size H 18.5mm L 455mm D25mm. • Acoustic D n,e,w (+/-) - vent open: 35(0;1). • Acoustic D n,e,w (+/-) - vent closed: 43 (0;0). • Air Leakage: 1.29 m3/h 0.36 L/s.
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