there were no mainstream vacuum cleaners specifically designed to attach a hose to the exhaust for the purpose of venting the exhaust outside. Most vacuum cleaners are designed to recirculate filtered air back into the room, and their exhaust systems are not intended for external venting.
Venting the exhaust outside can be a potential fire hazard and may not be recommended by the manufacturer, as it can disrupt the vacuum's airflow and potentially cause damage to the motor. It may also void the warranty.
If you're concerned about dust and the cost of replacing HEPA filters, consider looking for vacuum cleaners with washable and reusable filters. These filters can be cleaned and reused, reducing the need for frequent replacements. Additionally, some vacuum cleaners have better filtration systems to capture fine particles and allergens effectively.
Before making any modifications to a vacuum cleaner or attempting to vent its exhaust outside, it's essential to consult the manufacturer's guidelines and contact their customer support to ensure you are not violating any safety or warranty regulations.
For specialized needs like yours, it might be beneficial to explore industrial-grade vacuum systems that are designed for dust collection and external venting. These systems are more likely to have options for attaching hoses for external venting. However, they might be more expensive and might not be suitable for typical household use.
In any case, I recommend researching the latest available models on the market or contacting manufacturers directly for the most up-to-date information on vacuum cleaners with features that meet your specific requirements.