Lobster Back Cowl

What is it for?

If you have a problem with a steady blow back of smoke – this may be caused by unfavourable site conditions. As the wind strikes buildings and trees, areas of air pressure and suction are set up. The pressure may be greater than the upward pressure of the smoke rising up the flue. This pressure variation effect can be a problem where the chimney outlet is below the roof line or lower than surrounding buildings and trees. The Lobster Back Cowl is ideal for solving these problems, as it swivels freely – the vane at the top directs the open vent away from the prevailing wind and should produce suction at the correct point to allow efficient exhaust of fumes and smoke. Due to this mechanism, it also acts as a great solution for protection against driven rain. Maximum temperature of 250°C.

What sizes & options are available?

The Lobster Back Cowl is suitable for fitting to a round chimney pot or flue. It is available in two sizes: 1. The Model 180 for internal diameters between 115mm to 180mm (4.5” to 7”). 2. The Model 235 for internal diameters between 180mm to 235mm (7” to 9.5”). The Lobster Back Cowl is made from stainless steel with a cast aluminium base. It is available in natural (unpainted), or powder coated terracotta or black.

How do I fit one?

The Lobster Back Cowl is fitted using the hook bolts and external leg and stainless steel strap provided. It is suitable for fitting to a round chimney pot. However, special adaptors can be purchased in addition, to suit a variety of applications such as large round, square and even rectangular outlets. An adaptor plate is required for metal or plastic flues and ducts. Brewer also recommends the addition of an adaptor plate for exposed areas with high wind.