Roof Cowls – OMNIE Underfloor Heating, Heat Pumps & Ventilation
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Roof Cowls
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Roof Cowls

DS MVHR 09

UB41

 

This UB41 unit comprises a flat box hood on a circular up-stand, a 500 x 500mm lead flashing skirt and stepped adaptor which allows connections from 100mm to 160mm diameter ducting. All cowls and external grilles for ventilation should have a minimum separation of 1500mm-2000mm. In some circumstances this is not possible and can be reduced down to 300mm to meet building regulations.

Cowl – min 22 deg pitch / (150mm / 125mm connector) HR155 / CQ350

1. 150mm Comfo Pipe
2. 150mm Comfo Pipe collar
3. 90 deg 150mm elbow
4. UB41

The free vent areas and pressure/airflow resistance readings for the UB41 are below.

In instances where the CQ450 and CQ600 are used we have 2 x UB41 for the fresh air, and 2 x UB41 for the exhaust. The main duct-work uses a Y splitter from the 180mm duct-work to 2 x 150mm to provide the correct flow rate.

Diameter (mm)Free vent (mm2)Pressure/AirflowPressure/Airflow
Resistance (100m3/h)(Pascals) (225m3/h)
1007,8503.07.5
1108,8504.516.0
12512,2505.324.0
15017,7756.531.0

OTF4A

 

Flat roof.

Min 300mm distance between fresh air exhaust. Both Cowling’s must be fitted on the same elevation or roof pitch.

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