Overview

The Flanged Vertical Discharge Cowls are ideal in ducted systems where the fan is mounted remotely below roof level. They work together with a mechanical exhaust system while preventing the entry of rain when not in use. These durable and robust units are designed for mounting on circular duct and flue discharges using a flange. There are 11 sizes in the range handling airflows from 0.2 to 55 m3/s.

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Product Overview

Features and Benefits

Design

The Flanged Vertical Discharge Cowls are used as the discharge point where the fan is mounted elsewhere in the system yet vertical discharge exhaust is required. They are designed for relatively high air discharge velocity.

Backdraft Shutter

The units are fitted with reliable gravity air-operated backdraft shutters.

Specification

Casing

Cowls are manufactured from galvanised steel. Fitted with gravity air-operated backdraft shutters. The steel components have a corrosion resistant finish.

Backdraft Shutters

Sizes 40 to 80 are made from aluminium. Sizes 100 to 180 are made from galvanised sheet steel.

Additional Information

Flanged Vertical Discharge Cowls are designed for relatively high air discharge velocity. At low discharge velocities, rain could enter the building. For these types of applications an Alpha Relief Air Vent is recommended. For any application where prevailing winds may lift the shutters of the Flanged Vertical Discharge Cowl, we recommend the fitting of Magloks®. Ensure the hinge of the shutter points down the slope of the roof. The pressure loss through the cowl must be added to the system pressure loss before selecting the fan.