About this asset

This Revit family provides a standard conical discharge cowl, commonly referred to as a Chinese hat, for rooftop HVAC exhaust systems. The discharge cowl features a simple, functional conical design engineered for vertical air exhaust applications. It consists of a wide, sloped circular cap that protects the duct opening from rain ingress while allowing for efficient air discharge. The geometry is clean and lightweight, typically rendered in a neutral grey metallic finish. Its proportions are standard for industrial and commercial ventilation, designed to sit atop circular ductwork or roof-mounted exhaust fans. The form is purely utilitarian, focusing on aerodynamic performance and weather protection for mechanical ventilation systems across various building types.

The download is a 287 KB file containing a Revit family (.rfa). Load it into a project from the Insert tab with Load Family, then place it like any other component of its category; it schedules and tags with the rest of your model.

As a native Revit family, this component is designed for seamless integration into MEP models. Users can load this file into a project and host it on top of a vertical duct or exhaust fan termination point. It supports standard Revit parameter management, allowing for adjustments to diameter and height to match specific mechanical schedules. Ensure the connector is correctly mapped to the duct system for accurate airflow analysis and system drafting within the BIM environment.

This discharge cowl is essential for mechanical engineers and BIM coordinators working on industrial, commercial, or large-scale residential projects. It is primarily used at the terminal end of roof-mounted ventilation systems to prevent water ingress into the exhaust ductwork. Professionals will find this useful during the design development and construction documentation phases when detailing plant room ventilation or general building exhaust requirements. It pairs effectively with standard circular ducting, roof curbs, and industrial exhaust fans to complete the building services envelope.