Duct Wraps Tested to EN1366-3. European Fire Resistance Classification: EI120 minutes (Integrity & Insulation). Wraps provide up to 2 Hr Integrity & Insulation to rectangular PVC ventilation ducting penetrations. Simple & quick to install. Low profile design allows installation close soffit. Available to fit most common vent duct sizes. Only one wrap needed per penetration. Tested to EN1366-3 in Plasterboard using steel sleeves.