Header Box

Explore our range of ventilation header boxes at HVAC Warehouse, Australia's specialist HVAC supplier. A header box (also called a ceiling outlet box or plenum box) is a key component used to connect inline fans to ceiling-mounted exhaust grilles in bathrooms, laundries, and other domestic and commercial spaces. Our header boxes are designed to reduce noise, distribute airflow evenly, and provide a neat, professional finish to your ventilation installation. Compatible with standard inline fan ducting sizes, HVAC Warehouse header boxes are easy to install and meet Australian ventilation standards. Shop online for fast delivery across all Australian states.