Air path
Draw the filter, fan, duct, exhaust port and intake path before comparing products.
What to compare
Duct compatibility
Confirm diameter and connection type across the fan, filter, duct and tent port.
Losses
Allow for filter resistance, long duct runs, tight bends and speed settings; free-air CFM is not installed airflow.
Heat and humidity
Use room conditions and equipment heat when deciding the exchange target.
Noise and service
Check speed control, mounting and access needed to clean or replace the filter.
Before buying: confirm the exact model, package contents, current price, availability and compatibility at the manufacturer or retailer.