Based on this product's specifications, here are some alternatives and similar models
Signal Cover Simet PS2 Central Multiwall — model 37166008
Summary description:
Simet PS2 central Multiwall signal cover (model 37166008) is a purpose-built cover designed for use with ventilation and control systems to provide a visible signalling interface. The product is a central-type signal cover from Simet, compatible with Multiwall installations, intended for mounting where a durable, defined signalling point is required in HVAC or building services applications.